The most common and most likely answer to this crossword clue is the 7 letter word REEBOKS
I've seen this crossword clue in The Guardian
R
E
E
B
O
K
S
More clues leading to the result REEBOKS
Buddy explains!
The straight part
We know that "antelopes" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case antelopes = reeboks.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.
What does REEBOKS mean?
REEBOKS noun- A British-established American brand of athletic wear (rendered with a capital R as Reebok)
- A medium-sized, deerlike South African antelope, Pelea capreolus, having pale-gray, curly fur and straight horns.