Hindmost part (4)
I believe the answer is:
tail
'hindmost part' 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 "that can be cast by a lizard" , "weaker batsmen" , "Dog - or part of one" , "Follow - rear part of aeroplane" , "Elongated appendage of an animal" .)