Suffered when a revolutionary leader died (5)
I believe the answer is:
ached
'suffered' is the definition.
('ache' can be a synonym of 'suffer')
'a revolutionary leader died' is the wordplay.
'revolutionary' becomes 'che' (Che Guevara the Marxist revolutionary).
'leader' indicates taking the first letters.
The initial letter of 'died' is 'd'.
'a'+'che'+'d'='ACHED'
'when' acts as a link.
(Other definitions for ached that I've seen before include "Felt a dull pain" , "suffered" , "Yearned" , "Throbbed" , "Had a continuous pain" .)