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Poor salesmen had left out wholesale (2,5)

Ross

I believe the answer is:

en masse

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'wholesale' is the definition.
(both can mean as a group)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for en masse that I've seen before include "In force" , "In a group U altogether" , "in concert" , "Sees man (anag.)" , "Many as one" .)

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