A Conservative getting together with left, it's clear (6)
I believe the answer is:
acquit
'clear' is the definition.
('acquit' can be a synonym of 'clear')
'a conservative getting together with left' is the wordplay.
'conservative' becomes 'c' (abbreviation commonly used in UK politics).
'getting together' says to put letters next to each other.
'with' says to put letters next to each other.
'left' becomes 'quit' (I've seen this before**).
'a'+'c'+'quit'='ACQUIT'
'it's' acts as a link.
(Other definitions for acquit that I've seen before include "Release" , "Discharge as innocent, dismiss charge" , "Find not guilty" , "Exonerate" , "Discharge from court as innocent" .)