Cryptic crossword clue
Yen increased, provided one invested and got smarter? 9

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

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

The straight part
We know that "got smarter" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case got smarter = yuppified.
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.

Crossword Answer definitions

YUPPIFIED verb
  1. To redevelop (an urban area or commercial premises) so as to attract affluent young professionals as residents or clientele.

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