The most common and most likely answer to this crossword clue is the 9 letter word AD-LIBBED
I've seen this crossword clue in The Guardian
A
D
-
L
I
B
B
E
D
More clues leading to the result AD-LIBBED
Buddy explains!
The straight part
We know that "all made up" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case all made up = ad-libbed.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 AD-LIBBED mean?
AD-LIBBED verb- To improvise all or part of a speech or other performance, especially in comedy.
- Improvised, or performed without preparation.