Crossword Genius

Speak disparagingly to derelict (3-4)

Ross

I believe the answer is:

run down

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'derelict' is the definition.
(I know that derelict can be written as run-down)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for run down that I've seen before include "exhaust?" , "slightly off" , "brief summary" , "Drained" , "After search" .)

I've seen this clue in The Telegraph.
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