One serving patiently? (6)

I believe the answer is:

waiter

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'one serving' is the definition.

I cannot understand how the remainder of the clue works.

(Other definitions for waiter that I've seen before include "One paid to serve" , "Steward" , "One who serves at table" , "Attendant" , "Restaurant staff member" .)

I've seen this clue in the Evening Standard.

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