Jonas, maybe, or David (5)
I believe the answer is:
'david' is the definition.
Both the answer and definition are singular nouns.
Maybe there's an association between them I don't understand?
'jonas maybe' is the wordplay.
'maybe' is an anagram indicator.
'jonas' anagrammed gives 'JASON'.
'or' is the link.
Can you help me to learn more?
(Other definitions for jason that I've seen before include "Greek hero, captain of the Argo" , "Greek hero, leader of the Argonauts" , "Boy" , "He sailed the Argo to find the Golden Fleece" , "Greek hero who searched for the Golden Fleece" .)