Vacant English politician, no alternative for Tory (5)
I believe the answer is:
empty
'vacant' is the definition.
(similar in meaning)
'english politician no alternative for tory' is the wordplay.
'english' becomes 'E' (abbreviation).
'politician' becomes 'MP' (Member of Parliament).
'no alternative for tory' becomes 'ty' (I am not sure about this - if you are sure you should believe this answer much more).
'e'+'mp'+'ty'='EMPTY'
Can you help me to learn more?
(Other definitions for empty that I've seen before include "Devoid of content" , "Drained glass" , "Unfilled" , "Evacuate" , "Unoccupied" .)