Rep pleased to upset shopkeepers (12)

I believe the answer is:

tradespeople

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'shopkeepers' is the definition.
Both the definition and answer are plural nouns.
Maybe there's a link between them I don't understand?

'rep pleased to upset' is the wordplay.
'upset' indicates an anagram.
'rep'+'pleased'+'to'='reppleasedto'
'reppleasedto' anagrammed gives 'TRADESPEOPLE'.

Can you help me to learn more?

(Other definitions for tradespeople that I've seen before include "Skilled workers" , "folk in business" , "Eg, shopkeepers" .)

I've seen this clue in The Times.

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