The most common and most likely answer to this crossword clue is the 13 letter word PROVINCIALISM
I've seen this crossword clue in The Times
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Buddy explains!
The straight part
We know that "narrow outlook" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case narrow outlook = provincialism.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 PROVINCIALISM mean?
PROVINCIALISM noun- The quality of being provincial; having provincial tastes, mentality, manners.
- A word or locution characteristic of a region or district.