Treated ailing ruminant in Asia (6)

I believe the answer is:

nilgai

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'ruminant in asia' is the definition.
'nilgai' can be an answer for 'ruminant' (nilgai is a kind of ruminant). I'm not sure about the 'in asia' bit.

'treated ailing' is the wordplay.
'treated' is an anagram indicator.
'ailing' with letters rearranged gives 'NILGAI'.

Can you help me to learn more?

(Other definitions for nilgai that I've seen before include "animal" , "creature" , "Large Indian antelope, ailing (anag.)" .)

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