Subdued party with Nollywood's top actors (8)
I believe the answer is:
downcast
'subdued' is the definition.
(thesaurus)
'party with nollywood's top actors' is the wordplay.
'party' becomes 'do' (do can informally mean a party).
'top' indicates taking the first letters (in a down clue, the first letter is top).
'actors' becomes 'cast' (group of actors).
The initial letters of 'with nollywood' is 'wn'.
'do'+'wn'+'cast'='DOWNCAST'
(Other definitions for downcast that I've seen before include "Low in spirits" , "Sad" , "Feeling despondent" , "Dejected and discouraged" , "directed towards ground" .)