Knockout food shop threatening to break free of shackles (10)
I believe the answer is:
eliminator
'break free of shackles' is the definition.
The definition suggests a singular noun which matches the answer.
'knockout food shop threatening to' is the wordplay.
I cannot quite see how this works, but
'food' could be 'e' (E is an example) and 'e' is found in the answer.
'to' is found in the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for eliminator that I've seen before include "Heat" , "Hitman" , "Marine toil (anag) - it gets rid of something" .)