She presents a bit of a problem (5)

I believe the answer is:

poser

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

I cannot understand how the rest of the clue works.

(Other definitions for poser that I've seen before include "insincere?" , "Person still being portrayed" , "Attitudiniser" , "Question - a sitter" , "difficult puzzle" .)

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

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