Crossword Genius

Problem in composing prose (5)

Ross

I believe the answer is:

poser

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

'composing prose' is the wordplay.
'composing' indicates an anagram.
'prose' with letters rearranged gives 'POSER'.

'in' acts as a link.

(Other definitions for poser that I've seen before include "Puzzling question about ropes" , "Artist's model" , "Ropes (anag.)" , "Toughie" , "Tricky clue" .)

I've seen this clue in the Evening Standard.
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