Old coach station, one adopted by hunt (4,6)
I believe the answer is:
post chaise
'old coach' is the definition.
(I've seen this before)
'station one adopted by hunt' is the wordplay.
'station' becomes 'post' (synonyms).
'one' becomes 'i' (Roman numeral).
'adopted by' is an insertion indicator (I've seen this in other clues).
'hunt' becomes 'chase' (I've seen this in another clue).
'i' put into 'chase' is 'chaise'.
'post'+'chaise'='POST-CHAISE'
(Other definitions for post chaise that I've seen before include "Horse-drawn carriage" , "In old coach" , "carry letters in one" .)