Rabbit found in train at terminus (6)
I believe the answer is:
natter
'rabbit' is the definition.
(both can mean to talk excessively)
'in train at terminus' is the wordplay.
'in' indicates a hidden word.
'NATTER' is hidden within 'train at terminus'.
'found' is the link.
(Other definitions for natter that I've seen before include "idle talk" , "Chew the fat, shoot the breeze" , "Talk casually" , "Talk socially without exchanging too much information" , "Gossip, maybe annoyingly" .)