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Lumber market squirrelled away a couple of bucks (6)

Ross

I believe the answer is:

saddle

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'lumber' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for saddle that I've seen before include "Lumber (with); one on horse" , "Burden: pass" , "Burden; seat" , "A horseman's seat" , "Rider's seat" .)

I've seen this clue in the Sydney Morning Herald.
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