Jelly-like image (5)
I believe the answer is:
aspic
'jelly' is the definition.
(I know that aspic is a type of jelly)
'like image' is the wordplay.
'like' becomes 'as'.
'image' becomes 'pic' (short for picture).
'as'+'pic'='ASPIC'
(Other definitions for aspic that I've seen before include "Stock set with food" , "Savoury meat or fish jelly" , "garnish" , "Ending of Marlowe's thriller" , "Savoury relish" .)