Cryptic crossword clue
It doesn’t really make fast relative speed 6,4

The most common and most likely answer to this crossword clue is the 6 plus 4 letter word GRANNY KNOT

I've seen this crossword clue in The Daily Telegraph
G
R
A
N
N
Y
K
N
O
T

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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.

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