Flier helping to make restitution (3)

I believe the answer is:

tit

'flier' is the definition.
(type of bird)

'helping to make restitution' is the wordplay.
'helping to make' says the answer is hidden in the clue.
'TIT' is hidden within 'restitution'.

(Other definitions for tit that I've seen before include "18's [BIRD]" , "useless horse, or not?" , "Small garden bird" , "Boob made backing" , "Small bird that lives off insects" .)

I've seen this clue in the Evening Standard.

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