Crossword Genius

Disorder and mayhem without old Dave's partner? (4)

Ross

I believe the answer is:

chas

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'dave's partner?' is the definition.
(music duo Chas and Dave)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for chas that I've seen before include "man's name" , "Drinks" .)

I've seen this clue in The Independent.
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