The most common and most likely answer to this crossword clue is the 7 letter word ROEBUCK
I've seen this crossword clue in Financial Times
R
O
E
B
U
C
K
More clues leading to the result ROEBUCK
- Having green eggs first as does partner
- Ox not unknown to get stuck in crag – or some other animal
- Animal turning king to solid gold
- Stag week to end after heartless bouncer’s thrown out
- Loudly quarrel, resist deer
- Bank said to resist ruminant
- Throw eggs first? Animal!
- Bank said to have responsibility for animal
Buddy explains!

The straight part
We know that "some other animal" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case some other animal = roebuck.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 ROEBUCK mean?
ROEBUCK noun- A male roe deer.