Crossword Genius

There's science in serving drinks (6)

Ross

I believe the answer is:

optics

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

'science in serving drinks' is the definition.
'optics' can be an answer for 'science' (optics is a kind of science). I am unsure of the 'in serving drinks' bit.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for optics that I've seen before include "Science of vision/light" , "Scientific studies of light and vision, the eyes" , "Science concerned with vision" , "Science of light/vision" , "Devices to measure out alcohol" .)

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