2401: Sign here please

The unclued lights are of a kind and all have to be ignored in the completed grid.
 

Across

1    Fortune-teller worried small company chairmen. Right! (11)
7    Party goer often over the clutch (3)
11    Spike, I look anaemic! (6)
13    Prize stone cut with edge of blade (7)
15    Become liable to back police force and its patch (5)
18    Similar to a story about Bartok’s finale (5)
20    Outline is almost correct (6)
21    Sleep on board – records on film? (5)
22    About one, delivers a flower (7)
29    European birds in the housetops? (5)
30    Evil demon – one unattached and tense (6)
34    King leaves sophisticated city dweller – he cuts it fine (6)
36    Game birds flinch (5)
37    Out and about without direction (5)
38    Daily put back old timer (7)
39    Releases relatives having no answer (6)
40    Article of faith explained (3)
41    Steps in the market place? (11, two words)
 

Down

2    Cushioned, not active, getting attacked (8)
3    Fulminations from Brutus, lost without Latin in translation (9)
4    Banner about one clef (anagram) (12, two words)
5    Examine floor of boxing ring with second (7)
6    I’m in Bern, exchanging currency (8)
8    Fate’s no choice of letters (4)
9    Builder’s late (6)
10    Horse turns up. Say that again! (5)
12    French lad drinking soft mint drinks (6)
14    Cases and wine with boxer on holiday boat (12, two words)
19    Seller paid out for light shoe (10)
21    Supported accepting policy relegated to a minor position (9)
23    Euro’s worth to American professor who has retired (8)
24    One choice or another being topped (8)
26    Learner leaves Tuvalu, out touring a new island group (7)
28    General method to establish latitude (6)
35    Misbehaving youngster, intermittently aberrant (4)
 
A first prize of £30 for the first correct solution opened on 15 April. 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’.)