Crossword Genius

A problem in prose composition (5)

Ross

I believe the answer is:

poser

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

'prose composition' is the wordplay.
'composition' is an anagram indicator.
'prose' is an anagram of 'POSER'.

'in' acts as a link.

(Other definitions for poser that I've seen before include "subject for an artist?" , "Brain-teaser" , "Difficult problem" , "Someone behaving so as to be noticed" , "question master?" .)

I've seen this clue in the Evening Standard.
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