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Cad and mother missing in city in The Netherlands (6)

Ross

I believe the answer is:

rotter

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'cad' is the definition.
(I've seen this in another clue)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for rotter that I've seen before include "Something going off" , "Bad guy" , "rat" , "Bad lot" , "One decomposing" .)

I've seen this clue in The Hindu.
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