Wild ass turning orange (6)

I believe the answer is:

onager

'wild ass' is the definition.
(onager is a kind of wild ass)

'turning orange' is the wordplay.
'turning' indicates anagramming the letters.
'orange' anagrammed gives 'ONAGER'.

(Other definitions for onager that I've seen before include "wild beast" , "Variety of wild ass found in central Asia" , "ancient weapon" , "Orange Asiatic ass" , "donkey" .)

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