The most common and most likely answer to this crossword clue is the 9 letter word ARBITRARY
I've seen this crossword clue in The Times
A
R
B
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T
R
A
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Buddy explains!
The straight part
We know that "Capricious" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case capricious = arbitrary.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 ARBITRARY mean?
ARBITRARY noun- Anything arbitrary, such as an arithmetical value or a fee.
- (usually of a decision) Based on individual discretion or judgment; not based on any objective distinction, perhaps even made at random.
- Determined by impulse rather than reason; heavy-handed.
- Any, out of all that are possible.
- Determined by independent arbiter.
- Not representative or symbolic; not iconic.