Supports in reverses (5,2)
I believe the answer is:
backs up
'supports' is the definition.
('back up' can be a synonym of 'support')
'reverses' is the wordplay.
I cannot quite understand how this works, but
'reverses' could be 'backs' (I've seen this before) and 'backs' is found within the answer.
The remaining letters 'up' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
'in' is the link.
Can you help me to learn more?
(Other definitions for backs up that I've seen before include "Stands by" , "what annoying people get" , "Supports" .)