Cryptic crossword clue
Sporting event one’s bound to compete in 5-6,4

The most common and most likely answer to this crossword clue is the 17 letter word THREE-LEGGED RACE

I've seen this crossword clue in The Guardian
T
H
R
E
E
-
L
E
G
G
E
D
Â
 
R
A
C
E

Buddy explains!

The straight part
We know that "Sporting event" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case sporting event = three-legged race.
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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