Crossword Genius

Pushback from result of bad shop fitting? (15)

Ross

I believe the answer is:

countermovement

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'fitting?' is the definition.
Both the definition and answer are singular nouns.
Maybe there's an association between them I don't understand?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Another definition for countermovement that I've seen is " Motion opposing".)

I've seen this clue in The Times.
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