Cryptic crossword clue
Developing inclination to insert key, having turned up earlier 9

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

I've seen this crossword clue in Financial Times
P
U
B
E
S
C
E
N
T

Buddy explains!

The straight part
We know that "Developing" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case developing = pubescent.
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 PUBESCENT mean?

PUBESCENT noun
  1. An individual who is going through puberty.
PUBESCENT adjective
  1. At or just after the age of puberty.
  2. Covered with down or fine hairs.

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