Spike beer used by one politician (6)
I believe the answer is:
impale
'spike' is the definition.
('impale' can be a synonym of 'spike')
'beer used by one politician' is the wordplay.
'beer' becomes 'ale' (I've seen this before).
'used by' says to put letters next to each other.
'one politician' becomes 'imp' (I've seen this in other clues).
'ale' put after 'imp' is 'IMPALE'.
(Other definitions for impale that I've seen before include "spit!" , "Run through with stake" , "Pierce, run through" , "Pierce, me pail (anag.)" , "Kill by piercing with a spear or sharp pole" .)