Fur bundled in bales (5)

I believe the answer is:

sable

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'fur' is the definition.
(I know that sable is a type of fur)

'bundled in bales' is the wordplay.
'bales' anagrams to 'SABLE'.
But, I'm not clear how this is indicated.

Can you help me to learn more?

(Other definitions for sable that I've seen before include "North Asian marten" , "Bales of expensive Russian fur" , "Fur from member of weasel family" , "Fur - heraldic black" , "Bales of precious fur" .)

I've seen this clue in the Evening Standard.

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