Cryptic crossword clue
Raise doubt about half of a Canadian state being on top of a rift valley’s borders 5

The most common and most likely answer to this crossword clue is the 5 letter word QUERY

Q
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Y

Buddy explains!

The straight part
We know that "Raise doubt about" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case raise doubt about = query.
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 QUERY mean?

QUERY noun
  1. A question, an inquiry (US), an enquiry (UK).
  2. A question mark.
  3. A set of instructions passed to a database.
QUERY verb
  1. To ask a question.
  2. To ask, inquire.
  3. To question or call into doubt.
  4. To pass a set of instructions to a database to retrieve information from it.
  5. To send a private message to (a user on IRC).
  6. To send out a query letter.

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