Crossword Genius

Observed to be like a warmish drink (7)

Ross

I believe the answer is:

noticed

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'observed' is the definition.
('notice' can be a synonym of 'observe')

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for noticed that I've seen before include "remarked" , "Realised" , "Detected" , "regarded" , "Became aware of" .)

I've seen this clue in the Evening Standard.
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