It is an advantage to go slowly (4)

I believe the answer is:

edge

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'it is an advantage' is the definition.
(edge is a kind of advantage)

I can't explain the rest of the clue.

(Other definitions for edge that I've seen before include "marginal advantage" , "The part farthest from the middle" , "Sidle, lip" , "Excitement; boundary" , "Line where soething begins or ends" .)

I've seen this clue in The Guardian.

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