A revolutionary form of suffering (4)

I believe the answer is:

ache

'form of suffering' is the definition.
(type of pain)

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

(Other definitions for ache that I've seen before include "Long ? pain" , "Nagging pain" , "Persistent dull pain" , "Shakespearean character" , "Play up" .)

I've seen this clue in The Times.

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