Photographic cameo superimposed on to another print (5)
I believe the answer is:
inset
'photographic cameo superimposed on to another print' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for inset that I've seen before include "Picture placed within another" , "Inserted illustration" , "Something put into something else" , "Small picture placed within a larger one" , "day for teachers" .)