Feature of a hawk leaving Marxist alone (5)

I believe the answer is:

talon

'feature of a hawk' is the definition.
(hawks have talons)

'leaving marxist alone' is the wordplay.
'leaving' says the answer is hidden in the clue (the answer must leave the confines of the clue).
'TALON' is hidden in the letters of 'marxist alone'.

(Other definitions for talon that I've seen before include "Prey-bird's claw" , "E.g. hawk's claw" , "Tonal (anag.)" , "hunting hook" , "Bird's claw" .)

I've seen this clue in The Telegraph.

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