Start to complain after a sharp pain (6)

I believe the answer is:

twinge

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'sharp pain' is the definition.
(I've seen this in another clue)

I don't understand the remainder of the clue.

(Other definitions for twinge that I've seen before include "A slight jab of pain (6)" , "Small pain eg from conscience" , "Brief sharp pain" , "Sharp pang" , "A slight pain or pang" .)

I've seen this clue in the Sydney Morning Herald.

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