Composer almost makes party (4)
I believe the answer is:
rave
'party' is the definition.
(thesaurus)
'composer almost' is the wordplay.
'composer' becomes 'ravel' (I've seen this before).
'almost' means to remove the last letter (most of the word but not all of it).
'ravel' with its last letter taken away is 'RAVE'.
'makes' acts as a link.
(Other definitions for rave that I've seen before include "Illegal party; talk madly" , "Enthuse; rant" , "Talk wildly and angrily" , "Rant - noisy, all-night party" , "Rant about an all-night dance party?" .)