Crossword Genius

Drink supplier refuses to accept expression of thanks about one (7)

Ross

I believe the answer is:

barista

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'drink supplier' is the definition.
I know that 'drink' relates to this answer.

'refuses to accept expression of thanks about one' is the wordplay.
'refuses to accept' becomes 'bars' (I am not sure about this - if you are sure you should believe this answer much more).
'expression of thanks' becomes 'ta' (informal way of saying 'thank you').
'about' means one lot of letters goes inside another.
'one' becomes 'I' (Roman numeral).
'bars'+'ta'='barsta'
'barsta' placed around 'i' is 'BARISTA'.

Can you help me to learn more?

(Other definitions for barista that I've seen before include "Coffee expert" , "Starbucks employee" , "Coffee bar worker" , "coffee-maker" , "Coffee servitor" .)

I've seen this clue in The Independent.
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