Suffix with portrait (3)
I believe the answer is:
ure
'suffix with portrait' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ure that I've seen before include "Ripon's river" , "Wensleydale river" , "North Yorkshire river" , "River at Ripon" , "Midge --, singer" .)