Crossword Genius

Describes something greasy in college cafeteria (7)

Ross

I believe the answer is:

buttery

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

'cafeteria' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for buttery that I've seen before include "Where students could get food" , "larder" , "Like a dairy spread" , "Food store" , "Room for food and wine storage" .)

I've seen this clue in The Irish Times.
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