Crossword Genius

Where an intermediary goes (7)

Ross

I believe the answer is:

between

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'where' is the definition.
Both the definition and answer are adverbs. Maybe they are linked in a way I don't understand?

I can't explain the rest of the clue.

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(Other definitions for between that I've seen before include "In the space separating two objects" , "Been wet (anag.)" , "In the period separating (two events)" , "Betwixt" , "needle, not the smallest"" .)

I've seen this clue in the Evening Standard.
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