Opinion from left-wingers in straitened times almost never carefully examined (6)
I believe the answer is:
stance
'opinion' is the definition.
(I've seen this in other clues)
'left-wingers in straitened times almost never carefully examined' is the wordplay.
'left-wingers in' suggests taking the first letters (the furthest left letters in the words).
The first letters of 'straitened times almost never carefully examined' is 'STANCE'.
'from' is the link.
(Other definitions for stance that I've seen before include "Attitude (of body, mind)" , "Pose, for a golfer say" , "Player's posture for making, say, golf stroke" , "Position, at the tee perhaps" , "Enacts (anag)" .)