A small, small photograph of a savoury jelly (5)
I believe the answer is:
aspic
'a savoury jelly' is the definition.
(I've seen this before)
'a small small photograph' is the wordplay.
'small small' becomes 's' (abbreviation - e.g. clothes size; 'small' asks for an abbreviation).
'photograph' becomes 'pic' (I've seen this in other clues).
'a'+'s'+'pic'='ASPIC'
'of' acts as a link.
(Other definitions for aspic that I've seen before include "Clear meat or fish jelly" , "that's clear?" , "Ending of Marlowe's thriller" , "Savoury relish" , "Jelly made with fish or meat stock" .)