Crossword Genius

Those Corbynistas remaining? (4)

Ross

I believe the answer is:

left

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'remaining?' is the definition.
('left' can be a synonym of 'remaining')

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for left that I've seen before include "Outstanding" , "not consumed" , "Punch, perhaps" , "Went; port" , "Departed or bequeathed" .)

I've seen this clue in The Telegraph and The Sun.
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