Result rare, on breaking retail agreement (4,2,6)

I believe the answer is:

sale or return

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'retail agreement' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'result rare on breaking' is the wordplay.
'breaking' is an anagram indicator.
'result'+'rare'+'on'='resultrareon'
'resultrareon' anagrammed gives 'SALE OR RETURN'.

Can you help me to learn more?

(Other definitions for sale or return that I've seen before include "Marketing arrangement" , "Arrangement between vendor and supplier" .)

I've seen this clue in The Guardian.

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