Fellow returned again to a wife making beastly noise (6)
I believe the answer is:
heehaw
'making beastly noise' is the definition.
I can't judge whether this definition defines the answer.
'fellow returned again to a wife' is the wordplay.
I cannot really see how this works, but
'fellow' could be 'he' ('he' refers to a man) and 'he' is located in the answer.
'a' is found in the answer.
'wife' could be 'w' (abbreviation) and 'w' is present in the answer.
The remaining letters 'eh' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for heehaw that I've seen before include "Horse-laugh" , "Ass's bray" , "Donkey's bray" , "Braying sound of donkey" , "Donkey's cry" .)