Temple -- a party space rejected! (6)
I believe the answer is:
pagoda
'temple' is the definition.
(I know that pagoda is a type of temple)
'a party space rejected' is the wordplay.
'party' becomes 'do' (do is a kind of party).
'space' becomes 'gap' (gap is a kind of space).
'rejected' says the letters should be written in reverse.
'a'+'do'+'gap'='adogap'
'adogap' back-to-front is 'PAGODA'.
(Other definitions for pagoda that I've seen before include "Asian temple with up-turned eaves" , "Buddhist tower with several stories" , "Hindu temple shaped like pyramid" , "Sacred many-tiered temple" , "Oriental temple, often a tower" .)