Crossword Genius

One of those under the bed? (3)

Ross

I believe the answer is:

red

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'bed?' is the definition.
The answer and definition can be both natural objects as well as being singular nouns.
Perhaps there's an association between them I don't understand?

I can't explain the remainder of the clue.

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(Other definitions for red that I've seen before include "Colour for a blusher" , "- - poker: Kniphofia" , "could be a Marxist" , "Flushed" , "'If you see it, perhaps you're angry (3)'" .)

I've seen this clue in the Evening Standard.
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