Cryptic crossword clue
Dogmatic person that is keeping Doug and Leo rattled 9

The most common and most likely answer to this crossword clue is the 9 letter word IDEOLOGUE

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Buddy explains!

The straight part
We know that "Dogmatic person" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case dogmatic person = ideologue.
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 IDEOLOGUE mean?

IDEOLOGUE noun
  1. A person who advocates an ideology, especially as an official or preeminent advocate.

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