The most common and most likely answer to this crossword clue is the 8 letter word DEMENTED
D
E
M
E
N
T
E
D
Buddy explains!
The straight part
We know that "Mad" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case mad = demented.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 DEMENTED mean?
DEMENTED verb- To drive mad; to craze
- Insane or mentally ill.
- Suffering from dementia.
- Crazy; ridiculous.