The most common and most likely answer to this crossword clue is the 6 plus 5 letter word SQUASH COURT
I've seen this crossword clue in The Times
S
Q
U
A
S
H
C
O
U
R
T
More clues leading to the result SQUASH COURT
Buddy explains!
The straight part
We know that "sports venue" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case sports venue = squash court.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.