Crossword Genius

First-class swimming in the pool (3-4)

Ross

I believe the answer is:

top-hole

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

'first-class' is the definition.
Both the answer and definition are adjectives. Perhaps they are linked in a way I don't understand?

'swimming in the pool' is the wordplay.
'swimming in' is an anagram indicator.
'the'+'pool'='thepool'
'thepool' with letters rearranged gives 'TOP-HOLE'.

Can you help me to learn more?

(Other definitions for top-hole that I've seen before include "Excellent" , "First-rate" .)

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