The putter is the problem (5)
I believe the answer is:
poser
'problem' is the definition.
(poser is a kind of problem)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for poser that I've seen before include "Tricky question" , "This person's affected" , "Question; one trying to impress" , "one who has airs and graces" , "Toughie" .)