Crossword Genius

It goes around the edges of gloomy ravine (4)

Ross

I believe the answer is:

gyre

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'it goes around' is the definition.
The definition suggests a singular noun which matches the answer.

'edges of gloomy ravine' is the wordplay.
'edges of' means to remove the middle letters.
'ravine' becomes 're' (I can't explain this - if you can you should give a lot more credence to this answer).
'gloomy' with its middle removed is 'gy'.
'gy'+'re'='GYRE'

'the' acts as a link.

Can you help me to learn more?

(Other definitions for gyre that I've seen before include "Whirl, spiral" , "Literary circle" , "'A series of concentric circles, as flower petals say (4)'" .)

I've seen this clue in The Guardian.
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