The most common and most likely answer to this crossword clue is the 4 plus 4 letter word FALL FLAT
I've seen this crossword clue in The Daily Telegraph
F
A
L
L
F
L
A
T
More clues leading to the result FALL FLAT
- Founder lacking sparkle after trip
- Be unsuccessful finding accommodation after some time in US
- Don’t drop round — it will produce no response
- Don’t stand round showing what a bad crack will do
- Completely fail in autumn even
- Autumn accommodation for belly-flopper will have no effect
- Happen to be on the level but produce no response
- Die on apartment's collapse
- Fail to get accommodation post season
Buddy explains!

The straight part
We know that "what a bad crack will do" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case what a bad crack will do = fall flat.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.