Detective gets rough synopsis (6)
I believe the answer is:
digest
'synopsis' is the definition.
(I've seen this before)
'detective gets rough' is the wordplay.
'detective' becomes 'di' (Detective Inspector abbreviation).
'rough' indicates an anagram.
'gets' anagrammed gives 'gest'.
'di'+'gest'='DIGEST'
(Other definitions for digest that I've seen before include "Collection of shortened versions" , "Periodical that summarises the news" , "Absorb and assimilate, like food" , "Periodical that summarizes the news" , "Gradually come to understand" .)