The most common and most likely answer to this crossword clue is the 7 letter word PINKEST
P
I
N
K
E
S
T
Buddy explains!
The straight part
We know that "Most left wing" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case most left wing = pinkest.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does PINKEST mean?
PINKEST adjective- Having a colour between red and white; pale red.
- Of a fox-hunter's jacket: scarlet.
- Having conjunctivitis.
- By comparison to red (communist), describing someone who sympathizes with the ideals of communism without actually being a Russian-style communist: a pinko.
- Relating to women or girls.
- Relating to homosexuals as a group within society.