The most common and most likely answer to this crossword clue is the 9 letter word UNPOLITIC
I've seen this crossword clue in Financial Times
U
N
P
O
L
I
T
I
C
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The straight part
We know that "Indiscreet" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case indiscreet = unpolitic.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 UNPOLITIC mean?
UNPOLITIC adjective- Not in accordance with good policy.