Pass over retrograde art and poetry (8)
I believe the answer is:
traverse
'pass over' is the definition.
(synonyms)
'retrograde art and poetry' is the wordplay.
'retrograde' shows that the letters should be reversed in order.
'and' is a charade indicator (letters next to each other).
'poetry' becomes 'verse' (synonyms).
'art' reversed gives 'tra'.
'tra'+'verse'='TRAVERSE'
(Other definitions for traverse that I've seen before include "Cross sideways" , "Extend or bridge across" , "Go across" , "get across" , "Travel across or pass over" .)