Cryptic crossword clue
I presume a miler mistakenly covering a kilometre isn’t this 8,7

The most common and most likely answer to this crossword clue is the 8 plus 7 letter word IMPERIAL MEASURE

I've seen this crossword clue in The Sunday Telegraph
I
M
P
E
R
I
A
L
M
E
A
S
U
R
E

Buddy explains!

The straight part
We know that "kilometre isn’t this" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case kilometre isn’t this = imperial measure.
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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