Complain incoherently as male, say (6)
I believe the answer is:
mutter
'complain incoherently' is the definition.
'mutter' can be an answer for 'complain' (muttering is a kind of complaining). I am unsure of the 'incoherently' bit.
'male say' is the wordplay.
'male' becomes 'm' (common abbreviation).
'say' becomes 'utter' (to utter something is to speak or say it).
'm'+'utter'='MUTTER'
'as' acts as a link.
Can you help me to learn more?
(Other definitions for mutter that I've seen before include "Talk under one's breath" , "Lack of energy" , "Speak indistinctly or grumble" , "Mumble" , "Grumble under one's breath" .)