Popular photograph published (2,5)
I believe the answer is:
in print
'published' is the definition.
(I've seen this before)
'popular photograph' is the wordplay.
'popular' becomes 'in'.
'photograph' becomes 'print'.
'in'+'print'='IN PRINT'
(Other definitions for in print that I've seen before include "Published" , "(Of book) available" , "available from publisher" .)