His wife may bring endless woe to him (3)
I believe the answer is:
man
This clue might be a double definition.
'his' is the first definition.
(thesaurus)
'wife may bring endless woe to him' is the second definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
Can you help me to learn more?
(Other definitions for man that I've seen before include "Irish Sea isle" , "See 24" , "Individual" , "Staff the island" , "Fellow" .)