Crossword Genius

Border on which one is tense with anticipation (4)

Ross

I believe the answer is:

edge

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'border' is the definition.
(I know that edge is a type of border)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for edge that I've seen before include "Move furtively; intense quality" , "Sharp ridge" , "Rim, lip" , "Sidle, lip" , "small advantage" .)

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