On the trot in stable (8)
I believe the answer is:
together
This clue is a double definition.
'on the trot' is the first definition.
(I've seen this before)
'stable' is the second definition.
(I've seen this before)
'in' acts as a link.
(Other definitions for together that I've seen before include "Married" , "self-confidence" , "as a group" , "United; touching" , "One with another, simultaneously" .)