Insult someone male, equally hollow (4,1,5)
I believe the answer is:
cock a snook
'insult someone' is the definition.
I know nothing about this answer so I cannot judge whether this works.
'male equally hollow' is the wordplay.
'male' becomes 'cock' (male chicken).
'equally' becomes 'as' (synonyms).
'hollow' becomes 'nook' (I can't justify this - if you can you should give a lot more credence to this answer).
'cock'+'as'+'nook'='COCK A SNOOK'
Can you help me to learn more?
(Other definitions for cock a snook that I've seen before include "Show contempt (with thumb touching nose and fingers spread)" , "Gesture contemptuously" .)