Cryptic crossword clue
The first recipe, perhaps, for track sport 7,3

The most common and most likely answer to this crossword clue is the 7 plus 3 letter word FORMULA ONE

I've seen this crossword clue in The Times
F
O
R
M
U
L
A
O
N
E

Buddy explains!

The straight part
We know that "track sport" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case track sport = formula one.
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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