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It's edgy where there's a chance of falling overboard (7)

Ross

I believe the answer is:

gunwale

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'where there's a chance of falling overboard' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for gunwale that I've seen before include "Upper edge of ship's side" , "part of boat" , "Topmost planking of a wooden vessel" , "board" , "Part of craft" .)

I've seen this clue in the Evening Standard.
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