The most common and most likely answer to this crossword clue is the 7 letter word GEMSBOK
I've seen this crossword clue in The Guardian
G
E
M
S
B
O
K
Buddy explains!
The straight part
We know that "oryx" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case oryx = gemsbok.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 GEMSBOK mean?
GEMSBOK noun- A large African antelope (Oryx gazella).