All the unclued lights can be followed by the same word. Elsewhere, ignore three accents.

Across

12    Positive Belgian forward cutting in has chances (10)
13    Nabs informer admitting pressure (6)
18    Memorial to fish-keeper ignores a question about Frank? (9)
19    Flap about a kid whose name maybe on TV? (9)
20    This monster turns 22, nearly (4)
21    Blade that’s regularly perplexed (4)
27    In home, navy lamps may be so called (6)
30    Boring experience providing inspiration for smoker (4)
32    Ready reckoning when many are watching (5,4)
34    Ordinary one I help to get drunk? (9)
39    Meet the surge (6)
40    Tragically he has the last word in...