Restrict Tories' coaches (9)
I believe the answer is:
constrain
'restrict' is the definition.
(I know that constrain is a more specific form of the action restrict)
'tories' coaches' is the wordplay.
'tories'' becomes 'cons' (short for Conservatives).
'coaches' becomes 'train' (I've seen this before).
'cons'+'train'='CONSTRAIN'
(Other definitions for constrain that I've seen before include "Severely restrict" , "Lock up" , "Check" , "Confine, limit" , "Restrict scope of (an activity)" .)