One sits with problem (5)

I believe the answer is:

poser

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'problem' is the definition.
(I know that poser is a type of problem)

I don't understand the remainder of the clue.

(Other definitions for poser that I've seen before include "A puzzle made of ropes" , "Puzzle using ropes" , "Sticky problem" , "Hard problem" , "one who has airs and graces" .)

I've seen this clue in The Sun.

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