Siberian beast of burden extremely unfit (5)
I believe the answer is:
yakut
'siberian' is the definition.
(member of Siberian ethnic group)
'beast of burden extremely unfit' is the wordplay.
'beast of burden' becomes 'yak' (I've seen this before).
'extremely' says to hollow out the word (remove centre letters).
'unfit' with its centre taken out is 'ut'.
'yak'+'ut'='YAKUT'
I've seen this clue in The Guardian.
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