Six unclued lights (one of two words) are of a kind. The remaining three must be filled to display what connects the original six (13, two words).

Across

12    Old Rodin bust covered? (6)
13    Goal to mingle with rich ruler (8)
14    Horns from my province (5)
16    Reply from setter breaking lance (6)
19    E.g. Macron’s cheek, it’s said (4)
20    Complain over fabulist (4)
22    I’m going to exercise round one tree (6)
23    Knight with airs saves energy in verses (9)
29    Isles always in Comoros’s borders (4)
30    Nymph’s hot in green (4)
32    Head bishop ignored? Not again! (4)
34    Fluid drips onto engine part (6,3)
36    Reformer in Zaire cuts America out (6)
38    Stars’ primitive appeal (4)
39    Help receiving new issue (4)
42    Blair’s current joke boring Liberals (6)
43    In post, Henry’s disgrace (5)
44    Singers roughly shaking artist (8)
45    Water movement from red whale at first (6)

Down

1    Flicked fellows, cross about it (7)
2    Lovably active or badly off (8)
3    Medic grabs gold beetle (4)
4    Makes Greek coin with size I changed (9)
5    Prince hiding earl’s stuff (5)
6    I get promised frame of pine around shelf (7)
8    Past name for struggle (4)
9    Flower’s white round iceberg’s edge (6)
10    Volume in case upon switching periods in house? (10)
11    32 poetic question about one line? (7)
15    Ruling party admitting king’s crime (10)
17    She inherits Scot’s land areas in segments (10)
21    Composed Italian ode using concepts (10)
24    Iodine in the other new compound (4-5)
28    Cool actress hugs right soak (8)
29    Officer scars wild foxes (7)
31    Insects in north-east oddly flying (7)
33    Hesitation about articles in rock stratum (7)
35    Correctly placed model in India semi-nude? (2,4)
37    A German paper about to wing it (2-3)
40    Either tip from big tennis champ? (4)
41    Check shower, we hear (4)

Download a printable version here.

A first prize of £30 and two runners-up prizes of £20 for the first correct solutions opened on  13 March. Please scan or photograph entries and email them (including the crossword number in the subject field) to crosswords@spectator.co.uk, or post to: Crossword 2593, The Spectator, 22 Old Queen Street, London SW1H 9HP. Please allow six weeks for prize delivery. The dictionary prize is not available at present.