The most common and most likely answer to this crossword clue is the 4 letter word GAUR
G
A
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More clues leading to the result GAUR
Buddy explains!
The straight part
We know that "Indian bison" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case indian bison = gaur.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 GAUR mean?
GAUR noun- An East Indian species of wild cattle (Bos gaurus), of large size and an untamable disposition.