The most common and most likely answer to this crossword clue is the 6 letter word BOWLER
I've seen this crossword clue in The Guardian
B
O
W
L
E
R
More clues leading to the result BOWLER
- One taking over hat
- One who’ll deliver over in Derby
- Sportsman left in enclosure
- Sportsman with something more substantial than a cap
- British monarch keeps bird in hat
- Hat left in shady spot
- Delivery man‘s hat
- He flexes elbow and runs, hoping to limit them
- Cricketer‘s second ball gets wicket — England’s opener caught in both hands
- Delivery man?
Buddy explains!

The straight part
We know that "Delivery man?/Delivery man?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case delivery man?/delivery man? = bowler.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does BOWLER mean?
BOWLER noun- One who engages in the sport of bowling.
- The player currently bowling.
- A player selected mainly for his bowling ability.
- (1800s) The pitcher.
- A bowler hat; a round black hat formerly popular among British businessmen.