Coach taken in by others getting control (9)
I believe the answer is:
restraint
'control' is the definition.
(restraint is a kind of control)
'coach taken in by others' is the wordplay.
'coach' becomes 'train' ('train' can be a synonym of 'coach').
'taken in by' indicates putting letters inside.
'others' becomes 'rest' (I've seen this before).
'train' going within 'rest' is 'RESTRAINT'.
'getting' is the link.
(Other definitions for restraint that I've seen before include "Curb" , "Reserve" , "Moderation" , "Start rain as an impediment" , "Check" .)