Sheep wander out of ring (3)
I believe the answer is:
ram
'sheep' is the definition.
(I've seen this before)
'wander out of ring' is the wordplay.
'wander' becomes 'roam' ('roam' can be a synonym of 'wander').
'out of' indicates named letters should be taken away.
'ring' becomes 'o'.
'roam' with 'o' taken out is 'RAM'.
(Other definitions for ram that I've seen before include "Strike violently" , "Crash into, maybe for battering" , "Animal to batter" , "Butt" , "Aggressive sheep?" .)