Find club jolly (9)
I believe the answer is:
discovery
'find' is the definition.
(I know that find can be written as discovery)
'club jolly' is the wordplay.
'club' becomes 'disco' (night club).
'jolly' becomes 'very' (I've seen this in other clues).
'disco'+'very'='DISCOVERY'
(Other definitions for discovery that I've seen before include "Something newly found" , "Bay in southeast Australia" , "Find - Scott's ship" , "Detection, unearthing" , "Breakthrough" .)