Wild ass (6)

I believe the answer is:

onager

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

This is the entire clue.

(Other definitions for onager that I've seen before include "wild beast" , "The ass is a strange orange" , "donkey" , "Asian wild ass - orange (anag)" , "Variety of wild ass found in central Asia" .)

I've seen this clue in the Penny Press, The Guardian and the Evening Standard.

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