Cryptic crossword clue
Port in American city banks interest 9

The most common and most likely answer to this crossword clue is the 9 letter word CURIOSITY

I've seen this crossword clue in The Guardian
C
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Buddy explains!

The straight part
We know that "interest" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case interest = curiosity.
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 CURIOSITY mean?

CURIOSITY noun
  1. (uncountable) Inquisitiveness; the tendency to ask and learn about things by asking questions, investigating, or exploring.
  2. A unique or extraordinary object which arouses interest.
  3. Careful, delicate construction; fine workmanship, delicacy of building.

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