The most common and most likely answer to this crossword clue is the 7 letter word FRANTIC
I've seen this crossword clue in Independent
F
R
A
N
T
I
C
More clues leading to the result FRANTIC
- Wild financier finally not in favour of investing in soccer team
- . Fellow reportedly bottling it up when distraught
- Wild fellow, one caught in storm? On the contrary
- Furious tub-thumping I witnessed in Free Church
- Mad French caper
- Beside yourself there’s a note in old currency
- Note in former European money beside oneself
- Wild diatribe applied to one in soccer team
- Crazy French caper
- Loud rave, sick at heart and agitated
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 = frantic.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 FRANTIC mean?
FRANTIC noun- A person who is insane or mentally unstable, madman.
- Insane, mentally unstable.
- In a state of panic, worry, frenzy or rush.
- Extremely energetic