In each of eleven clues there is an added letter in the definition part. These letters, in clue order, spell two words, each of which is a definition of an unclued light. The lights in question, as synonymous terms, indicate the way in which the other unclued lights are supplied. Two unclued lights consist of two words each.
 

Across

 
10    Nurse in a muddle losing seconds (4)
12    Artist, vicious one, ruins author’s spokesman (10)
14    Defer complete ecstasy (3)
15    Rapacious custom reversed by one in charge (8)
17    Party left in tangle (5)
19    Fuel in turn taken round in load (6)
22    Want author with rage deprived of following (6)
24    Money in westward land for cars (5)
26    Tends to go clumsily, something like an elephant (9)
27    Shrubs over heads cut by noon (9)
29    In essence dedication’s given up (5)
31    Part of sonnet established in collection (6)
34    Main ground and house (6)
36    See university celebrate removal of parasites (7)
38    Important date in honour of goddess (5)
39    Goat round bin ate badly and died (8)
40    Way of working with good cast (3)
41    Clinical worker perhaps is impressive, inwardly tense (10)
 

Down

 
2    Enlisted men all deep in trouble (10)
3    Stun quiet house with puzzle, ignoring rule (7)
4    Spots answer in curious vein (5)
5    Put in order, consuming time after inspector faltered (9)
6    Boar and not human being (6)
7    Trainer they partly dread (5)
8    Waxes skin? Not I (4)
9    Tipsy toper set for avowal (12)
16    Coal house put up (3)
19    Refuse tips of dubious kinds (6)
20    Work in drag learned (6)
21    Fold up article supporting tree in trouble (10)
23    Plain English European in broadcast tries (9)
28    Droll lines after silly score (7)
30    Transaction involving nickel rejected (6)
33    Excited saint in voice (5)
35    Notice clamour for extra piece of software (5, hyphened)
37    Scrambled onto camel (4)
 
A first prize of £30 for the first correct solution opened on 23 March. 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 2201, The Spectator, 22 Old Queen Street, London SW1H 9HP. Please allow six weeks for prize delivery.