Cryptic crossword clue
A foreign revolutionary steals a bit — it’s not returned 10

The most common and most likely answer to this crossword clue is the 10 letter word UNREQUITED

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

The straight part
We know that "not returned" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case not returned = unrequited.
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 UNREQUITED mean?

UNREQUITED adjective
  1. Unanswered; not returned; not reciprocated; not repaid.

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