He was inundated with entries from couples (4)
I believe the answer is:
noah
'he' is the definition.
'inundated with entries from couples' is the wordplay.
I cannot really understand how this works, but
'from' could be 'o' (I've seen this in other clues) and 'o' is found within the answer.
The remaining letters 'nah' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'was' is the link.
Can you help me to learn more?
(Other definitions for noah that I've seen before include "Old ship builder" , "Webster?" , "First collector of animals?" , "Biblical sailor" , "Biblical arkwright" .)