Is a pirate one? Of course! Am annoyed! (6)
I believe the answer is:
seaman
'is a pirate one?' is the definition.
I can't judge whether this definition defines the answer.
'of course am annoyed' is the wordplay.
'of' says the answer is hidden in the clue.
'SEAMAN' is hidden within 'course am annoyed'.
Can you help me to learn more?
(Other definitions for seaman that I've seen before include "A manse (anag.)" , "Mariner" , "Sailor" , "crew member" .)