Crossword Genius

One recruited in spring to oversee servers (4,6)

Ross

I believe the answer is:

head waiter

I'm a little stuck... Click here to teach me more about this clue!

'one' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

I can't explain the remainder of the clue.

Can you help me to learn more?

(Another definition for head waiter that I've seen is " Who may serve".)

I've seen this clue in The Guardian.
Want a hint initially instead of a full solution? Install my app