Crossword Genius

The putter is the problem (5)

Ross

I believe the answer is:

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

I don't understand how the remainder of the clue works.

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(Other definitions for poser that I've seen before include "Puzzle using ropes", "Someone behaving so as to be noticed", "Difficult problem", "Tricky clue", "Baffling question or problem".)