The unclued lights are of a kind and are listed together in Chambers 2011. Solvers should highlight two normally clued solutions which together form another theme-word.
 

Across

 
1    Ties series of games with instrumentalists (11, two words)
7    Small county’s struggle (3)
11    Clog has lost its tip – repaired clog (6)
16    Young lad from Nantwich, rising (5)
17    Number one difficulty in the Big Apple (6)
18    Old count makes school on time (5)
20    Dazed state from formal protest? Not half (6)
21    Salesman’s patter at station 13 (5)
22    Publishing what the petitioner is doing (7)
27    Sketch exchanges components of rugby formation (7)
29    Spruce comparative would be blue (7)
34    Small company with drawback showing little courage (6)
36    Joint for the archbishop? (5)
38    Discharge out of isle (7)
39    Boeotian article on currency (6)
40    Formality is ditched regularly (3)
41    The set apart with zero taxes are voters (11)
 

Down

 
1    Radical help brought up in taverns, The Apache and The Comanche say (10, two words)
3    Fiery Celt out to astonish (9)
4    Swimwear and big sun-hat. It’s novel (12, two words)
5    Saw why the wedding cake wasn’t ready (7)
6    Bungler may possibly seem ill – hospital involved (8)
8    Revolution’s leader with German watch on river (4)
9    Composer when drinking port is light-headed (6)
10    Group note during the month (5)
12    Pain causes a shock, locally (6)
14    Request in late October for new tractor and trike (12, three words)
21    Scoutcraft? (9, two words)
23    It’s fundamental that most of the port is missing for island north of Orkney (8)
24    It binds sport dressing outside (8)
26    10 am. That is wrong for this performance (7)
28    Sea snail in tree, wriggling (6)
31    A lookout’s commendation (5)
33    Foreign article on the single currency (5)
35    The French shelter in cabriolet (4)
 
A first prize of £30 for the first correct solution opened on 7 July. There are two runners-up prizes of £20. (UK solvers can choose to receive the latest edition of the Chambers Dictionary instead of cash— ring the word ‘Dictionary’.) Entries to: Crossword 2167, The Spectator, 22 Old Queen Street, London SW1H 9HP. Please allow six weeks for prize delivery.