Move backwards using right exit (7)
I believe the answer is:
regress
'move backwards' is the definition.
'right exit' is the wordplay.
'right' becomes 'r' (abbreviation).
'exit' becomes 'egress' (I've seen this before).
'r'+'egress'='REGRESS'
'using' acts as a link.
(Other definitions for regress that I've seen before include "Go back to a worse condition" , "Decline" , "Return or revert" , "Go back to more primitive state" , "Backslide" .)