Left-winger has pace (4)
I believe the answer is:
trot
I believe this clue is a double definition.
'left-winger' is the first definition.
(I've seen this before)
'pace' is the second definition.
(thesaurus)
'has' is the link.
(Other definitions for trot that I've seen before include "Old communist" , "Slowish run, of horse or person" , "Hurry along" , "Horse's pace - Communist" , "Go or walk briskly" .)