The most common and most likely answer to this crossword clue is the 8 letter word YARMOUTH
I've seen this crossword clue in Financial Times
Y
A
R
M
O
U
T
H
More clues leading to the result YARMOUTH
- Lad found carrying weapon in Norfolk town
- Department in minor seaside town
- Lad collaring member for IOW town
- Young person carrying weapon in town …
- Gun-toting kid somewhere on an island
- Immature person carrying weapon to port
- 27 town boy holsters weapon
- English resort of volatile Trump– “Ahoy!”
- Great place for a jolly fellow in adolescence
- Youngster carrying gun somewhere west of Newport
Buddy explains!
The straight part
We know that "27 town" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case 27 town = yarmouth.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.