Possum's gripper (4)
I believe the answer is:
tail
'possum's gripper' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for tail that I've seen before include "Trail (behind comet)" , "Follow closely - taper (off)" , "Animal's elongated appendage" , "weaker batsmen" , "Dog - end" .)