The most common and most likely answer to this crossword clue is the 4 plus 3 plus 7 letter word HELL FOR LEATHER
I've seen this crossword clue in The Daily Telegraph
H
E
L
L
F
O
R
L
E
A
T
H
E
R
More clues leading to the result HELL FOR LEATHER
- He will pop round border at great speed
- Anguish over boundary, reportedly hit very hard and at great speed
- Very quickly, nightmare affected Flora there
- Torment parent, embracing naughty role very quickly
- Agony over boundary reportedly hit very hard and extremely fast
- The man will have hectic father role quite fast
Buddy explains!
The straight part
We know that "extremely fast" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case extremely fast = hell for leather.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 HELL FOR LEATHER mean?
HELL FOR LEATHER adverb- As fast as possible; recklessly fast.