Assembled portrayal of it, following page just released (8)
I believe the answer is:
photofit
'assembled portrayal' is the definition.
(image assembled by police)
'of it following page just released' is the wordplay.
'following' is a charade indicator (letters next to each other).
'page' becomes 'p'.
'just released' becomes 'hot' (hot off the press).
'of'+'it'='ofit'
'p'+'hot'='phot'
'ofit' after 'phot' is 'PHOTOFIT'.
(Other definitions for photofit that I've seen before include "match perhaps" , "Help for witness" , "Impression of police suspect" , "identification of suspect" , "Suspect picture" .)