Somewhat jollies along social gathering (5)
I believe the answer is:
salon
'social gathering' is the definition.
(thesaurus)
'somewhat jollies along' is the wordplay.
'somewhat' indicates the answer is hidden within the clue.
'SALON' is hidden in the letters of 'jollies along'.
(Other definitions for salon that I've seen before include "Elegant room - for hairdresser?" , "Drawing room" , "Reception room in grand house" , "Hairdresser's shop" , "Literary gathering" .)