Fellow engaged in moral philosophy (5)
I believe the answer is:
ralph
'fellow' is the definition.
Both the answer and definition are singular nouns.
Perhaps you can see an association between them that I don't see?
'engaged in moral philosophy' is the wordplay.
'engaged in' indicates the answer is hidden within the clue.
'RALPH' can be found hidden inside 'moral philosophy'.
Can you help me to learn more?
(Other definitions for ralph that I've seen before include "Man's name" , "--- Waldo Emerson, US writer" , "- Vaughan Williams, English composer" , "Boy's name" , "N Waldo Emerson, nineteenth century US poet" .)