Man that is inexperienced (6)
I believe the answer is:
rookie
'man that is inexperienced' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'man that is' is the wordplay.
'man' becomes 'rook' (rook is a kind of man).
'that is' becomes 'ie' (short for Latin 'id est', 'that is').
'rook'+'ie'='ROOKIE'
Can you help me to learn more?
(Other definitions for rookie that I've seen before include "New (police) recruit (colloq.)" , "inexperienced fighter" , "new team member" , "New recruit as to army" , "Raw recruit" .)