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What, ultimately, college student gets up to (5)

Ross

I believe the answer is:

until

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'up to' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

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(Other definitions for until that I've seen before include "Up to (a point in time)" , "Not beyond (hour)" , "Unlit (anag.)" , "As late as" , "Before a given time" .)

I've seen this clue in The Independent.
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