Photograph biography as work of art (5,4)
I believe the answer is:
still life
'work of art' is the definition.
(thesaurus)
'photograph biography' is the wordplay.
'photograph' becomes 'still' (still is a kind of photograph).
'biography' becomes 'life' ('life' can be a synonym of 'biography').
'still'+'life'='STILL-LIFE'
'as' acts as a link.
(Other definitions for still life that I've seen before include "work of art" , "Drawing" , "Painting genre" , "artwork" , "Painting of flowers, fruit, etc" .)