Senior Tory leaders getting in by means of Panorama (5)
I believe the answer is:
vista
'panorama' is the definition.
(I know that panorama can be written as vista)
'senior tory leaders getting in by means of' is the wordplay.
'leaders' says to take the initial letters.
'getting in' indicates putting letters inside.
'by means of' becomes 'via' (via can mean 'by means of' or 'using').
The first letters of 'senior tory' is 'st'.
'st' put into 'via' is 'VISTA'.
(Other definitions for vista that I've seen before include "Pleasing view" , "Perspective" , "Broad prospect" , "Prospect, view" , "Panoramic scene" .)