Go backwards regarding poetry (7)
I believe the answer is:
reverse
'go backwards' is the definition.
(I've seen this before)
'regarding poetry' is the wordplay.
'regarding' becomes 're'.
'poetry' becomes 'verse' ('verse' can be a synonym of 'poetry').
're'+'verse'='REVERSE'
(Other definitions for reverse that I've seen before include "come back" , "Upset" , "Travel backwards" , "Countermand" , "contrary" .)