For the occasion, speaker's to take more white wine (2,3)

I believe the answer is:

ad hoc

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

'for the occasion' is the definition.
(I have seen 'specific occasion' mean 'ad hoc' so perhaps 'occasion' could also mean 'ad hoc')

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for ad hoc that I've seen before include "For a specific purpose - latin phrase" , "not in general practice" , "For one specific case" , "One-off" , "unplanned" .)

I've seen this clue in The Guardian.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.