Tradesman distributing tar oil (6)

I believe the answer is:

tailor

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'tradesman' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps there's an association between them I don't understand?

'distributing tar oil' is the wordplay.
'distributing' is an anagram indicator.
'tar'+'oil'='taroil'
'taroil' anagrammed gives 'TAILOR'.

Can you help me to learn more?

(Other definitions for tailor that I've seen before include "fitter" , "person before soldier and sailor in list" , "Garment maker" , "One makes suits etc. to measure" , "Maker of clothes for men" .)

I've seen this clue in the Evening Standard.

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