The most common and most likely answer to this crossword clue is the 11 letter word MARCHIONESS
I've seen this crossword clue in Independent
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More clues leading to the result MARCHIONESS
- Noble big beast heading off to follow procession
- Noble big cat has walk displacing start of lunch
- Tramp, prowler doffing cap, is noble
- Noblewoman in demonstration is collaring individuals
- Monthon lake for titled lady
- Noble creature with pride beheaded after moving protest
- Aristocrat to protest over troublesome noises
- Lady Muck initially rich as one’s poor
Buddy explains!

The straight part
We know that "Noble" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case noble = marchioness.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 MARCHIONESS mean?
MARCHIONESS noun- The wife of a marquess.
- A woman holding the rank of marquess in her own right.