The most common and most likely answer to this crossword clue is the 7 letter word ANORAKS
I've seen this crossword clue in Financial Times
A
N
O
R
A
K
S
More clues leading to the result ANORAKS
- Ask about acquiring girl’s jackets
- One runs amongst the trees for protection
- Those with narrow interest, Noah’s Ark possibly, hard going?
- Article’s a classic, capturing ultimate character of computer geeks
- Socially awkward types ask to be moved when girl comes in
- Coats of arms’ contents replaced with characters represented in Koran
- A woman starts to knit some jackets
Buddy explains!

The straight part
We know that "Those with narrow interest" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case those with narrow interest = anoraks.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 ANORAKS mean?
ANORAKS noun- A heavy weatherproof jacket with an attached hood; a parka or windcheater.
- A geek or nerd, possibly originally either a train spotter or a fan of off-shore pirate radio.