It floats in pools (5)

I believe the answer is:

sloop

I'm a little stuck... Click here to teach me more about this clue!

'it floats' is the definition.
The definition suggests a singular noun which matches the answer.

'pools' is the wordplay.
'pools' anagrams to 'SLOOP'.
But, I am not sure how the anagram is indicated.

'in' is the link.

Can you help me to learn more?

(Other definitions for sloop that I've seen before include "Sailboat" , "craft" , "Type of sailing boat" , "something that's rigged" , "One-masted sailing ship" .)

I've seen this clue in the Evening Standard.

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