Lively celebration (7)
I believe the answer is:
shindig
'lively celebration' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for shindig that I've seen before include "Hidings (anag) - party" , "Lively party, knees-up" , "Noisy knees-up" , "Bash" , "Noisy disturbance" .)