Vacant English politician, vacuous Tory (5)
I believe the answer is:
empty
'vacant' is the definition.
(similar in meaning)
'english politician vacuous tory' is the wordplay.
'english' becomes 'e' (abbreviation).
'politician' becomes 'MP' (Member of Parliament).
'vacuous' means to remove the middle letters.
'tory' with its middle taken out is 'ty'.
'e'+'mp'+'ty'='EMPTY'
(Other definitions for empty that I've seen before include "'. . . . . vessels make the most sound'" , "Containing nothing" , "Unoccupied" , "(Of words) insincere" , "(Of words) lacking sincerity" .)