Flies pirated version? (7)
I believe the answer is:
diptera
'flies' is the definition.
(I've seen this before)
'pirated version?' is the wordplay.
'version?' indicates anagramming the letters (I've seen 'version' mean this).
'pirated' is an anagram of 'DIPTERA'.
(Other definitions for diptera that I've seen before include "Insects" , "Flighty little types" , "Flies" .)