Politician gets into ale's new taste (6)
I believe the answer is:
sample
'taste' is the definition.
(sample can mean to taste or try)
'politician gets into ale's new' is the wordplay.
'politician' becomes 'MP' (Member of Parliament).
'gets into' indicates putting letters inside.
'new' indicates an anagram.
'ales' is an anagram of 'sale'.
'mp' inserted inside 'sale' is 'SAMPLE'.
(Other definitions for sample that I've seen before include "Cross section" , "Specimen; sound clip" , "Small part intended to represent the whole" , "Test piece" , "Drop of" .)