Get Democrat locked up (7)
I believe the answer is:
secured
'locked up' is the definition.
(I've seen this before)
'get democrat' is the wordplay.
'get' becomes 'secure' (securing is a kind of getting).
'democrat' becomes 'd'.
'secure'+'d'='SECURED'
(Other definitions for secured that I've seen before include "Gained" , "Got by special effort" , "Seized" , "Rescued (anag.)" , "Apprehended" .)