Male in scrambled aircrew fighting atrocity? (3,5)
I believe the answer is:
war crime
'fighting atrocity?' is the definition.
(atrocity committed when fighting war)
'male in scrambled aircrew' is the wordplay.
'male' becomes 'm' (common abbreviation).
'in' is an insertion indicator.
'scrambled' is an anagram indicator.
'aircrew' is an anagram of 'warcrie'.
'm' inserted inside 'warcrie' is 'WAR CRIME'.
(Other definitions for war crime that I've seen before include "Breach of international law governing conflict" , "Act of genocide" , "Violation of the Geneva Conventions" , "Violation of accepted rules of conflict" , "Offence during conflict" .)