A revolutionary has an awfully uncomfortable sensation (4)
I believe the answer is:
ache
'sensation' is the definition.
(I know that ache is a type of unpleasantness)
'a revolutionary has an' is the wordplay.
'a revolutionary' becomes 'che' (Che Guevara).
'has' is a charade indicator (letters next to each other).
'an' becomes 'a'.
'che' put after 'a' is 'ACHE'.
'awfully uncomfortable' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for ache that I've seen before include "Twinge" , "Persistent dull pain" , "Continuous hurt" , "Pine" , "strong feeling" .)