When it's soft and terribly sore, there's a problem (5)

I believe the answer is:

poser

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'there's a problem' is the definition.
(poser is a kind of problem)

I can't explain the rest of the clue.

(Other definitions for poser that I've seen before include "One pretends to be something they are not" , "Sticky problem" , "Question - a sitter" , "Person still being portrayed" , "Pseud" .)

I've seen this clue in the Evening Standard.

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