Person who delivers headgear (6)
I believe the answer is:
bowler
This might be a double definition.
'person who' is the first definition.
'bowler' can be an answer for 'person' (bowler is a kind of person). I am not sure about the remainder of the definition.
'headgear' is the second definition.
(bowler is a kind of headgear)
'delivers' acts as a link.
Can you help me to learn more?
(Other definitions for bowler that I've seen before include "Round black hat with brim" , "Hat that is round and hard with a narrow brim" , "See 8" , "Sportsman" , "Derby" .)