I run into head buccaneer (6)
I believe the answer is:
pirate
'buccaneer' is the definition.
(historical term for a pirate)
'i run into head' is the wordplay.
'run' becomes 'r' (cricket abbreviation).
'into' is an insertion indicator.
'head' becomes 'pate' (humorous term for the head).
'i'+'r'='ir'
'ir' put within 'pate' is 'PIRATE'.
(Other definitions for pirate that I've seen before include "Corsair" , "Penzance marauder ?" , "plagiarist" , "Captain Hook, say" , "Copy published material illegally" .)