They involve many a clever sale (5)

I believe the answer is:

deals

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'they involve' is the definition.
The definition suggests an adverb but the answer is not.

'many a clever sale' is the wordplay.
'many' becomes 'd' ().
'a clever' indicates an anagram.
'sale' with letters rearranged gives 'eals'.
'd'+'eals'='DEALS'

Can you help me to learn more?

(Other definitions for deals that I've seen before include "Business agreements" , "Business transactions" , "Distributes playing cards" , "Bargains" , "Passes cards around" .)

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