Red squirrels often viewed in England's tree tops (6)

I believe the answer is:

soviet

'red' is the definition.
(red is an informal term for a communist)

'squirrels often viewed in england's tree tops' is the wordplay.
'tops' suggests taking the first letters.
The initial letters of 'squirrels often viewed in englands tree' is 'SOVIET'.

(Other definitions for soviet that I've seen before include "Former Russian council" , "Elected council in a communist country" , "Union of ... Socialist Republics" , "Elected council in former USSR" , "Old Russian council" .)

I've seen this clue in The Guardian.

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