Wanders round sheep outside (5)
I believe the answer is:
roams
'wanders' is the definition.
('roam' can be a synonym of 'wander')
'round sheep outside' is the wordplay.
'round' becomes 'o' (round can mean a round object).
'sheep' becomes 'rams' (male sheep).
'outside' indicates putting letters inside.
'o' inserted into 'rams' is 'ROAMS'.
(Other definitions for roams that I've seen before include "Wanders about, rambles" , "Is traveller" .)