The most common and most likely answer to this crossword clue is the 9 letter word QUALIFIER
Q
U
A
L
I
F
I
E
R
Buddy explains!

The straight part
We know that "Maybe" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case maybe = qualifier.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 QUALIFIER mean?
QUALIFIER noun- One who qualifies for something, especially a contestant who qualifies for a stage in a competition.
- A preliminary stage of a competition.
- (grammar) A word or phrase, such as an adjective or adverb, that describes or characterizes another word or phrase, such as a noun or verb; a modifier; that adds or subtracts attributes to another.
- A marker that qualifies or modifies another code element.