Prince with attractive clothes, a simple fellow (7)
I believe the answer is:
halfwit
'a simple fellow' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps you can see a link between them that I don't see?
'prince with attractive clothes' is the wordplay.
'prince' becomes 'hal' (Shakespearean nickname of Henry V when a prince).
'with' becomes 'w' (abbreviation).
'attractive' becomes 'fit' (fit can informally mean attractive).
'clothes' indicates putting letters inside (some letters clothe or cover others).
'w' put inside 'fit' is 'fwit'.
'hal'+'fwit'='HALFWIT'
Can you help me to learn more?
(Other definitions for halfwit that I've seen before include "Being stupid" , "Mug" , "Charlie?" , "One only 50% all there?" , "Idiot" .)