Crossword Genius

Some reptiles sported at surgery (9)

Ross

I believe the answer is:

tetrapods

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

'some reptiles' is the definition.
The answer and definition can be both animals as well as being plural nouns.
Maybe you can see an association between them that I can't see?

'sported at surgery' is the wordplay.
'sported at' anagrams to 'TETRAPODS'.
Though, I am unsure how this is indicated.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.
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