Others deluge Tory leader for control (9)
I believe the answer is:
restraint
'control' is the definition.
(restraint is a kind of control)
'others deluge tory leader' is the wordplay.
'others' becomes 'rest' (I've seen this before).
'deluge' becomes 'rain' (I've seen this in other clues).
'tory leader' becomes 't' (I've seen this in other clues).
'rest'+'rain'+'t'='RESTRAINT'
'for' is the link.
(Other definitions for restraint that I've seen before include "Control, restriction, curtailment" , "controlling influence" , "Limiting device" , "It keeps someone or something under control" , "Self-discipline" .)