Restrains (5)
'restrains' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Another definition for reins in that I've seen is " Checks".)
'restrains' is the definition.
(curbing is a kind of restraining)
This is the entire clue.
(Other definitions for curbs that I've seen before include "Restrains" , "Keeps in check" , "Place restrictions on" .)
'restrains' is the definition.
(inhibiting is a kind of restraining)
This is all the clue.
(Other definitions for inhibits that I've seen before include "Curbs, limits" , "Restrains or prevents, say growth" , "Bottles up" .)