Criminal masculine element (10)
I believe the answer is:
malefactor
'criminal' is the definition.
(I know that criminal can be written as malefactor)
'masculine element' is the wordplay.
'masculine' becomes 'male' (associated in meaning).
'element' becomes 'factor' (synonyms).
'male'+'factor'='MALEFACTOR'
(Other definitions for malefactor that I've seen before include "Wrongdoer" , "Sinner" , "culprit?" , "One doing wrong" , "Criminal, evil-doer" .)