The most common and most likely answer to this crossword clue is the 4 plus 3 letter word FLAT OUT
I've seen this crossword clue in The Daily Telegraph
F
L
A
T
O
U
T
More clues leading to the result FLAT OUT
- As quickly as possible, lying down
- Even unacceptable at top speed
- Florida salesman using every effort
- Very quickly shattered
- Home and away, using every effort
- In Florida, a solicitor’s using every effort
- Nuisance for driver revealed at top speed
- Ignore rules going round a kind of junction as fast as possible
- Going at full speed — or lying prone on the ground
- Lbw, say, hitting pad at high speed
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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 FLAT OUT mean?
FLAT OUT adjective- Complete, total, downright.
- Very busy.
- Lazy, sleeping.
- At top speed.
- Bluntly, no holds barred, totally, outright.