Greek character can, always, make an insurrectionist (8)
I believe the answer is:
mutineer
'an insurrectionist' is the definition.
(I know that mutineer is a type of freedom fighter)
'greek character can always' is the wordplay.
'greek character' becomes 'mu' (letter from the Greek alphabet).
'can' becomes 'tin' (synonyms).
'always' becomes 'eer' (poetic way of saying ever).
'mu'+'tin'+'eer'='MUTINEER'
'make' is the link.
(Other definitions for mutineer that I've seen before include "One openly rebelling" , "Rebel as against Captain Bligh" , "Christian, say" , "Rebellious soldier" , "Seafarer or soldier who refuses to obey authorities" .)