Lessons a rep arranged for colleague in shop? (11)

I believe the answer is:

salesperson

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'colleague in shop?' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps there's a link between them I don't understand?

'lessons a rep arranged' is the wordplay.
'arranged' is an anagram indicator (letters rearranged).
'lessons'+'a'+'rep'='lessonsarep'
'lessonsarep' anagrammed gives 'SALESPERSON'.

'for' is the link.

Can you help me to learn more?

(Other definitions for salesperson that I've seen before include "Shop attendant" , "Shop assistant" , "Retail worker" , "One must try to improve business" , "Shop server" .)

I've seen this clue in The Times.

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