Ask the CO to order best-sellers (3,5)

I believe the answer is:

hot cakes

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'best-sellers' is the definition.
I can't judge whether this definition defines the answer.

'ask the co to order' is the wordplay.
'to order' indicates an anagram.
'ask'+'the'+'co'='asktheco'
'asktheco' is an anagram of 'HOT CAKES'.

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(Another definition for hot cakes that I've seen is " They disappear quickly!".)

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