Restricted, checked (6,2)
I believe the answer is:
reined in
This clue is a double definition.
'restricted' is the first definition.
(I've seen this before)
'checked' is the second definition.
(I've seen this before)
(Other definitions for reined in that I've seen before include "Stopped or slowed up, a horse perhaps" , "Slowed up one's horse" , "Curbed" , "'Slowed, checked (6,2)'" , "restricted" .)