Breezes through full of enthusiasm (4)
I believe the answer is:
zest
'enthusiasm' is the definition.
(zest can mean enthusiasm or eagerness)
'breezes through full of' is the wordplay.
'full of' indicates the answer is hidden within the clue (inside).
'ZEST' is hidden within 'breezes through'.
(Other definitions for zest that I've seen before include "Verve, gusto" , "Enthusiasm - grated lemon peel" , "Drive" , "Orange-peel" , "Go" .)