Apparently having fun quite early (2,4,4)
I believe the answer is:
in good time
'early' is the definition.
(I've seen this before)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for in good time that I've seen before include "Quite early enough" , "How the drummer should play" , "Without risk of being late" , "Quickly" , "Certainly not late" .)