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Temperature dropped in hot water layer (4)

Ross

I believe the answer is:

seam

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'layer' is the definition.
(seam is a kind of layer)

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

Can you help me to learn more?

(Other definitions for seam that I've seen before include "Stratum (of a mineral)" , "Join round cricket ball" , "The line where two edges are stitched together" , "Sewn join" , "Underground layer of mineral" .)

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