The most common and most likely answer to this crossword clue is the 5 letter word MANLY
I've seen this crossword clue in The Daily Telegraph
M
A
N
L
Y
More clues leading to the result MANLY
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 = manly.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 MANLY mean?
MANLY adjective- Having the characteristics of a man.
- Having qualities befitting a man; courageous, resolute, noble.