Show without a party (5)
I believe the answer is:
revel
'party' is the definition.
(I've seen this in another clue)
'show without a' is the wordplay.
'show' becomes 'reveal' (revealing is a kind of showing).
'without' suggests deleting specific letters.
'reveal' with 'a' taken away is 'REVEL'.
(Other definitions for revel that I've seen before include "Take great pleasure" , "Take great delight (in)" , "Merrymaking" , "Make merry; luxuriate (in)" , "party" .)