Priest, possibly, a small dainty person (6)
I believe the answer is:
sprite
'a small dainty person' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps there's a link between them I don't understand?
'priest possibly' is the wordplay.
'possibly' indicates an anagram.
'priest' with letters rearranged gives 'SPRITE'.
Can you help me to learn more?
(Other definitions for sprite that I've seen before include "water pixie" , "Puck, say" , "sports car" , "Dainty type" , "A fairy or goblin" .)