Party in command is Conservative (5)
I believe the answer is:
disco
'party' is the definition.
(I've seen this before)
'in command is conservative' is the wordplay.
'in' indicates a hidden word.
'DISCO' can be found hidden inside 'command is conservative'.
(Other definitions for disco that I've seen before include "Demonic spirit" , "Style of pop music" , "Place to dance to recorded music, in short" , "music supplier" , "Discotheque (abbrev.)" .)