The most common and most likely answer to this crossword clue is the 5 letter word ADDAX
I've seen this crossword clue in The Times
A
D
D
A
X
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The straight part
We know that "antelope" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case antelope = addax.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 ADDAX mean?
ADDAX noun- A large African antelope (Addax nasomaculatus), with long horns, that lives in the desert.