Trump exposed party (5)
I believe the answer is:
outdo
'trump' is the definition.
(I know that trump can be written as outdo)
'exposed party' is the wordplay.
'exposed' becomes 'out' (out on display).
'party' becomes 'do' (do can informally mean a party).
'out'+'do'='OUTDO'
(Other definitions for outdo that I've seen before include "going to top?" , "Surpass, go one better than" , "Perform better than, be superior to" , "Exceed" , "Be better in performance (than another person)" .)