A pained expression (4)

I believe the answer is:

ouch

'a pained expression' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for ouch that I've seen before include "Pained cry" , "that's painful" , "that hurts!" , "response to a bad pun" , "Expression of pain" .)

I've seen this clue in The Globe and Mail.

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