Furious corsair lost head (5)
I believe the answer is:
irate
'furious' is the definition.
(I know that furious can be written as irate)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for irate that I've seen before include "Indignant, angry" , "Spitting feathers" , "raging" , "Fuming" , "Aggrieved" .)