Company offering service for six, wine served up (8)

I believe the answer is:

provider

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'company offering service' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe there's a link between them I don't understand?

'for six wine served up' is the wordplay.
'for' becomes 'pro' (as in being 'pro' something).
'six' becomes 'VI' (Roman numerals).
'wine' becomes 'red wine' (red is a type of wine).
'served up' says the letters should be written in reverse (in a down clue, going upwards).
'red' back-to-front is 'der'.
'pro'+'vi'+'der'='PROVIDER'

Can you help me to learn more?

(Other definitions for provider that I've seen before include "Supplier" , "Source of support" .)

I've seen this clue in The Telegraph.

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