Amusingly eccentric (6)
'amusingly eccentric' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for madcap that I've seen before include "Crazy fellow" , "Impetuous irresponsible person" , "Dare-devil" , "Camp ad (anag.)" , "Harum-scarum" .)
'amusingly eccentric' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for zany that I've seen before include "Amusingly unconventional" , "Absurd" , "Like a buffoon" , "Bizarrely comic" , "Central African river" .)