Free lunch Ainsley provides (7)

I believe the answer is:

unchain

'free' is the definition.
(I've seen this before)

'lunch ainsley provides' is the wordplay.
'provides' says the answer is hidden in the clue.
'UNCHAIN' can be found hidden inside 'lunch ainsley'.

(Other definitions for unchain that I've seen before include "Release from bondage" , "Free" , "Release from fetters" , "loose" .)

I've seen this clue in The Telegraph.

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