Crossword Genius

The question of a model? (5)

Ross

I believe the answer is:

poser

I believe this is a double definition.

'the question' is the first definition.
(poser is a kind of question)

'a model?' is the second definition.
('poser' can be a synonym of 'model')

'of' is the link.

(Other definitions for poser that I've seen before include "Question - a sitter" , "Puzzling question about ropes" , "Hard question" , "What's difficult" , "Toughie" .)

I've seen this clue in the Evening Standard.
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