Crossword Genius

Criminal charge -- appeal regularly dismissed? Go downhill fast (6)

Ross

I believe the answer is:

rappel

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'dismissed? go downhill fast' is the definition.
Although both the answer and definition are verbs in their base form, I can't understand how one could define the other.

'criminal charge appeal regularly' is the wordplay.
'criminal charge' becomes 'rap' (I've seen this before).
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
The alternate letters of 'appeal' are 'pel'.
'rap'+'pel'='RAPPEL'

Can you help me to learn more?

(Other definitions for rappel that I've seen before include "Abseil" , "going down" , "abseiling" .)

I've seen this clue in The Telegraph.
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