Crossword Genius

What a revolutionary suffers? (4)

Ross

I believe the answer is:

ache

I'm a little stuck... Click here to teach me more about this clue!

'what a revolutionary suffers?' is the definition.
I can't tell whether this defines the answer.

'what a revolutionary' is the wordplay.
I cannot really understand how this works, but
'a' is within the answer.
'revolutionary' could be 'che' (Che Guevara the Marxist revolutionary) and 'che' is present in the answer.
No letters remain.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for ache that I've seen before include "Dull prolonged pain" , "Nagging pain" , "A dull lingering pain" , "Play up" , "Feel sore" .)

I've seen this clue in The Guardian.
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