Fellow broke a drain (6)
I believe the answer is:
adrian
'fellow' is the definition.
Both the answer and definition are singular nouns.
Maybe there's an association between them I don't understand?
'broke a drain' is the wordplay.
'broke' is an anagram indicator.
'a'+'drain'='adrain'
'adrain' anagrammed gives 'ADRIAN'.
Can you help me to learn more?
(Other definitions for adrian that I've seen before include "Boy's name" , "Man" , "-- Mole, Sue Townsend's creation" , "Boy" , "The Secret Diary of ... Mole, Aged 13? (Sue Townsend)" .)