Wander round as dog without tail? (4)
I believe the answer is:
rove
'wander round' is the definition.
'dog without tail?' is the wordplay.
'dog' becomes 'rover' (I've seen this before).
'without tail?' means to remove the last letter (I've seen 'without tail' mean this).
'rover' with its last letter taken away is 'ROVE'.
'as' is the link.
(Other definitions for rove that I've seen before include "Wander or walk about" , "Roam about aimlessly" , "Ramble, roam, wander" , "Don't stay in one place" , "Range" .)