Money for a side of beef? (6)

I believe the answer is:

silver

I'm a little stuck... Click here to teach me more about this clue!

'money' is the definition.
(thesaurus)

I can't explain the rest of the clue.

(Other definitions for silver that I've seen before include "Sliver of precious metal" , "Soft, white, precious metal" , "old folk?" , "Second-rank medal" , "Pretty tree with peeling bark" .)

I've seen this clue in the Evening Standard.

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