Crossword Genius

Rev with beer finds an edge at sea (7)

Ross

I believe the answer is:

gunwale

I'm a little stuck... Click here to teach me more about this clue!

'an edge at sea' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'rev with beer' is the wordplay.
'rev' becomes 'gun' (I've seen this in another clue).
'with' becomes 'w' (short for with).
'beer' becomes 'ale' (type of beer).
'gun'+'w'+'ale'='GUNWALE'

'finds' is the link.

Can you help me to learn more?

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

I've seen this clue in The Telegraph and The Sun.
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