Exemplary poser (5)
I believe the answer is:
model
This clue is a double definition.
'exemplary' is the first definition.
(model can mean exemplary or ideal)
'poser' is the second definition.
(e.g. a model for an artist - someone who poses)
(Other definitions for model that I've seen before include "Perfect" , "dummy" , "Poser for painter or photographer" , "clothes horse?" , "who displays it" .)