Be a sponge (5)
I believe the answer is:
mooch
'be a sponge' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for mooch that I've seen before include "bum" , "Move aimlessly" , "Hang around aimlessly" , "Walk aimlessly around" , "Loiter listlessly" .)