Climbed hill around outskirts of Trowbridge (7)
I believe the answer is:
mounted
'climbed' is the definition.
('mount' can be a synonym of 'climb')
'hill around outskirts of trowbridge' is the wordplay.
'hill' becomes 'mound' (mound is a kind of hill).
'around' indicates putting letters inside.
'outskirts of' says to hollow out the word (remove centre letters).
'trowbridge' with its centre removed is 'te'.
'mound' placed around 'te' is 'MOUNTED'.
(Other definitions for mounted that I've seen before include "Rose" , "On a steed" , "riding horses" , "Prepared for exhibition" , "On horseback" .)