Crossword Genius

Sat and drank from these? (8)

Ross

I believe the answer is:

tankards

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

'sat and' is the definition.
I can't tell whether this defines the answer.

'drank from these?' is the wordplay.
I cannot really see how this works, but
an anagram of 'drank' is 'nkard' which is within the answer.
The remaining letters 'tas' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for tankards that I've seen before include "Large beer mugs" , "Large one-handled drinking mugs" , "Large one-handled drinking vessels" , "One-handled beer mugs" .)

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