Cryptic crossword clue
Rees-Mogg finally abandoning common sense in support of fool’s unjustified claim 10

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

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Buddy explains!

The straight part
We know that "unjustified claim" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case unjustified claim = assumption.
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 ASSUMPTION mean?

ASSUMPTION noun
  1. The act of assuming, or taking to or upon oneself; the act of taking up or adopting.
  2. The act of taking for granted, or supposing a thing without proof; a supposition; an unwarrantable claim.
  3. The thing supposed; a postulate, or proposition assumed; a supposition.
  4. The minor or second proposition in a categorical syllogism.
  5. The taking of a person up into heaven.
  6. A festival in honor of the ascent of the Virgin Mary into heaven, celebrated on 15 August.
  7. Assumptio.

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