Leftist finally retired (3)

I believe the answer is:

red

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'leftist' is the definition.
(red can informally mean communist)

'finally retired' is the wordplay.
'RED' is hidden in amongst the letters.
But, I'm uncertain how this is indicated.

Can you help me to learn more?

(Other definitions for red that I've seen before include "Type of wine" , "Colour for danger" , "Colour of 1 across" , "Blushing" , "Inflamed" .)

I've seen this clue in the Evening Standard.

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