Declared to be satisfied about Tories' leader (6)
I believe the answer is:
stated
'declared' is the definition.
('stated' can be a synonym of 'declared')
'satisfied about tories' leader' is the wordplay.
'satisfied' becomes 'sated' (I've seen this before).
'about' is an insertion indicator.
'leader' indicates taking the first letters.
The first letter of 'tories' is 't'.
'sated' placed around 't' is 'STATED'.
'to be' is the link.
(Other definitions for stated that I've seen before include "Declared or asserted" , "Announced" , "Expressed in speech or writing" , "Clearly expressed" , "Declared as fact" .)