Greek character, villain in canoe (7)
I believe the answer is:
pirogue
'canoe' is the definition.
(type of Central American canoe)
'greek character villain' is the wordplay.
'greek character' becomes 'pi' (letter from the Greek alphabet).
'villain' becomes 'rogue' (rogue is a kind of villain).
'pi'+'rogue'='PIROGUE'
'in' is the link.
(Other definitions for pirogue that I've seen before include "Dugout canoe" , "One needing a row" , "shallow conveyance" , "hollow craft" .)