Crossword Genius

Stalin foe to walk on air (7)

Ross

I believe the answer is:

trotsky

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'stalin foe' is the definition.
The definition suggests a singular noun which matches the answer.

'walk on air' is the wordplay.
'walk' becomes 'trot' (trotting is a kind of walking).
'on' is a charade indicator (letters next to each other).
'air' becomes 'sky'.
'trot'+'sky'='TROTSKY'

'to' is the link.

Can you help me to learn more?

(Other definitions for trotsky that I've seen before include "Russian revolutionary assassinated in Mexico" , "Bolshevik" , "Former Communist" , "Russian assassinated in nineteen forty" , "Revolutionary ousted by Stalin" .)

I've seen this clue in The Sun.
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