Restrictive (5)

'restrictive' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for tight that I've seen before include "Snug" , "Taut" , "Rigid; drunk" , "Penny-pinching" , "Drunk; restricted" .)
(Other definitions for binding that I've seen before include "Obligatory" , "Mandatory" , "work for a bookmaker" .)