Court's first ace for server (7)

I believe the answer is:

barista

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'server' is the definition.
(I know that barista is a type of server)

'court's first ace' is the wordplay.
'court's' becomes 'bar' (I can't justify this - if you can you should give a lot more credence to this answer).
'first' becomes 'ist' (ist resembles bst).
'ace' becomes 'a' (abbreviation).
'bar'+'ist'+'a'='BARISTA'

'for' is the link.

Can you help me to learn more?

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

I've seen this clue in The Independent.

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