Crossword Genius

A revolutionary in pain (4)

Ross

I believe the answer is:

ache

'pain' is the definition.
(ache is a kind of pain)

'a revolutionary' is the wordplay.
'revolutionary' becomes 'che' (Che Guevara the Marxist revolutionary**).
'a'+'che'='ACHE'

'in' is the link.

(Other definitions for ache that I've seen before include "Hurt; yearn" , "Suffer dull pain" , "Longing" , "Continuous hurt" , "Dull prolonged pain" .)

I've seen this clue in The Telegraph.
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