Cryptic crossword clue
Pet, say, on lead for exercise excited corgi? That’s positive 9

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

I've seen this crossword clue in Financial Times
C
A
T
E
G
O
R
I
C

Buddy explains!

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

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