Crossword Genius

Big drink with Resistance Movement (5)

Ross

I believe the answer is:

large

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'big' is the definition.
(synonyms)

I don't understand how the remainder of the clue works.

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(Other definitions for large that I've seen before include "Lake" , "substantial" , "Sizeable" , "Big, almost regal" , "Extensive" .)

I've seen this clue in The Independent.
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