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Current large division over division of pupils (4,6)

Ross

I believe the answer is:

gulf stream

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'current' is the definition.
(Gulf stream is an example)

I don't understand the remainder of the clue.

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(Other definitions for gulf stream that I've seen before include "North Atlantic Drift" , "Warm Atlantic current" , "thats currently warming us" .)

I've seen this clue in The Telegraph.
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