A male said to be unprincipled (6)
I believe the answer is:
amoral
'be unprincipled' is the definition.
(thesaurus)
'a male said' is the wordplay.
'a male' becomes 'am' (I've seen this in other clues).
'said' becomes 'oral' (I've seen this before).
'am'+'oral'='AMORAL'
'to' is the link.
(Other definitions for amoral that I've seen before include "Unconcerned with correctness" , "Lacking any ethical sense" , "Without moral standards or principles" , "Lacking any ethical standards" , "Having no standards of right or wrong" .)