The most common and most likely answer to this crossword clue is the 8 plus 6 letter word JOGGER’S NIPPLE
I've seen this crossword clue in The Guardian
J
O
G
G
E
R
â
€
™
S
N
I
P
P
L
E
Buddy explains!
The straight part
We know that "sporting injury" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case sporting injury = jogger’s nipple.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.