Crossword Genius

Presume swimming is best (7)

Ross

I believe the answer is:

supreme

'is best' is the definition.
(I've seen this before)

'presume swimming' is the wordplay.
'swimming' indicates anagramming the letters (letters swim around into a new order).
'presume' anagrammed gives 'SUPREME'.

(Other definitions for supreme that I've seen before include "Best of all" , "Chief" , "Highest in rank - incomparable" , "Creamy sauce" , "topmost level" .)

I've seen this clue in The Guardian.
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