Left-winger receives a card (5)
I believe the answer is:
tarot
'card' is the definition.
(tarot cards are used to tell fortunes)
'left-winger receives a' is the wordplay.
'left-winger' becomes 'trot' (short for Trotskyite).
'receives' indicates putting letters inside (inserted letters are received).
'trot' going around 'a' is 'TAROT'.
(Other definitions for tarot that I've seen before include "Cards used for fortune telling" , "Special cards for fortune-telling" , "These cards are used by fortune tellers" , "One in special suit" , "These cards are used to tell fortunes" .)