The most common and most likely answer to this crossword clue is the 3 plus 8 letter word OLD TRAFFORD
O
L
D
T
R
A
F
F
O
R
D
More clues leading to the result OLD TRAFFORD
Buddy explains!
The straight part
We know that "75,000-capacity ground" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case 75,000-capacity ground = old trafford.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.