The most common and most likely answer to this crossword clue is the 2 plus 7 letter word GO BANANAS
I've seen this crossword clue in Financial Times
G
O
B
A
N
A
N
A
S
More clues leading to the result GO BANANAS
- Vulgar speaker given tropical fruit flip
- See red, green and yellow items
- Leave fruit — lose it!
- Game hand makes you freak out
- Be wildly excited putting pineapple to mouth
- Blow a gasket while following West Indian round block
- Become mad and bang on as a loony
- Flip three articles into traps
- Turn round the bend and become very angry
- Turn hand, getting fly off the handle
Buddy explains!
The straight part
We know that "Blow" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case blow = go bananas.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.