Supports clogs (5,2)
I believe the answer is:
backs up
I believe this is a double definition.
'supports' is the first definition.
('back up' can be a synonym of 'support')
'clogs' is the second definition.
('back up' can be a synonym of 'clog')
(Other definitions for backs up that I've seen before include "what annoying people get" , "Stands by" , "Supports" .)