South Park's leading character properly animated (9)
I believe the answer is:
sprightly
'animated' is the definition.
(I've seen this in another clue)
'south park's leading character properly' is the wordplay.
'leading character' suggests taking the first letters.
'properly' becomes 'rightly' (in the proper or right way).
The first letters of 'south parks' is 'sp'.
'sp'+'rightly'='SPRIGHTLY'
(Other definitions for sprightly that I've seen before include "Vivacious" , "Lively" , "Moving nimbly" , "Active" , "Brisk" .)