He aims for the heart (5)
I believe the answer is:
cupid
'he aims for the heart' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
This is the entire clue.
Can you help me to learn more?
(Other definitions for cupid that I've seen before include "Armed boy" , "a help to Santa" , "Love-god" , "Roman Eros" , "The little love god" .)