Blackbeard maybe wanting head hacked off (5)
I believe the answer is:
irate
'hacked off' is the definition.
(I've seen this before)
'blackbeard maybe wanting head' is the wordplay.
'blackbeard maybe' becomes 'pirate'.
'wanting head' means to remove the first letter.
'pirate' with its initial letter taken away is 'IRATE'.
(Other definitions for irate that I've seen before include "Narked" , "Extremely cross" , "Full of 22" , "Indignant, angry" , "Extremely angry" .)