Crossword Genius

Judge that's dressed down in bed (4)

Ross

I believe the answer is:

rate

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'judge' is the definition.
(I know that rate is a type of appraise)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for rate that I've seen before include "The number of times something happens in a given period" , "Estimate or deserve" , "See 12" , "Assess; be worthy of" , "Assess or grade" .)

I've seen this clue in The Telegraph.
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