Crossword Genius

Cold sponge's bottom needs to be on top (5)

Ross

I believe the answer is:

aloof

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'cold' is the definition.
(both can mean distant)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for aloof that I've seen before include "Unpleasantly cold" , "Withdrawn, distant" , "Remote in manner" , "Displaying supercilious reserve" , "A fool being cool and remote" .)

I've seen this clue in The Times.
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