Sort of finish picture (5)
I believe the answer is:
photo
'finish picture' is the definition.
'photo' can be an answer for 'picture' (photo is a kind of picture). I'm not certain of the 'finish' bit.
'sort of' is the wordplay.
'sort' becomes 'phot' (I can't explain this - if you can you should believe this answer much more).
'of' becomes 'o'.
'phot'+'o'='PHOTO'
Can you help me to learn more?
(Other definitions for photo that I've seen before include "Camera picture" , "Snap, picture" , "Snap, exposure, in short" , "Picture, in short" , "This race finish is very close" .)