The most common and most likely answer to this crossword clue is the 9 letter word QUESTIONS
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More clues leading to the result QUESTIONS
Buddy explains!

The straight part
We know that "Doubts" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case doubts = questions.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 QUESTIONS mean?
QUESTIONS noun- A sentence, phrase or word which asks for information, reply or response; an interrogative.
- A subject or topic for consideration or investigation.
- A doubt or challenge about the truth or accuracy of a matter.
- A proposal to a meeting as a topic for deliberation.
- (chiefly with definite article) Interrogation by torture.
- Talk; conversation; speech.
- To ask questions about; to interrogate; to enquire for information.
- To raise doubts about; have doubts about.
- To argue; to converse; to dispute.
- A game in which players must only say questions, and if they don't they lose.