Forgotten heart of Tory minister (6)
I believe the answer is:
pastor
'minister' is the definition.
(I know that minister can be written as pastor)
'forgotten heart of tory' is the wordplay.
'forgotten' becomes 'past' (past can mean forgotten or finished).
'heart of' says to take the centre.
The middle letters of 'tory' are 'or'.
'past'+'or'='PASTOR'
(Other definitions for pastor that I've seen before include "Old shepherd" , "who may provide a service" , "A sport (anag)" , "To spar with clergyman" , "Minister; shepherd" .)