Go backwards concerning poetry (7)
I believe the answer is:
reverse
'go backwards' is the definition.
(I've seen this in another clue)
'concerning poetry' is the wordplay.
'concerning' becomes 're' (both can mean on a particular topic).
'poetry' becomes 'verse' (synonyms).
're'+'verse'='REVERSE'
(Other definitions for reverse that I've seen before include "Drive backwards" , "come back" , "contrary" , "Severer (anag.)" , "Countermand" .)