One gored badly crossing western forest (9)
I believe the answer is:
greenwood
'forest' is the definition.
(I know that greenwood is a type of forest)
'one gored badly crossing western' is the wordplay.
'badly' is an anagram indicator.
'crossing' is an insertion indicator.
'western' becomes 'w'.
'one'+'gored'='onegored'
'onegored' is an anagram of 'greenood'.
'greenood' placed around 'w' is 'GREENWOOD'.
(Other definitions for greenwood that I've seen before include "territory for outlaws" , "unspoiled countryside" , "Under the -- Tree (Thomas Hardy)" .)