Glibly repeat, left-winger expelled (4,3)
I believe the answer is:
'glibly repeat' is the definition.
(as in trotting out a cliche)
'left-winger expelled' is the wordplay.
'left-winger' becomes 'trot' (short for Trotskyite).
'expelled' becomes 'out' (I've seen this in another clue).
(Other definitions for trot out that I've seen before include "Repeat without thought" , "Produce for show (repeatedly)" , "Produce (a well-worn account)" .)