Crossword Genius

Swimmer, for his part, splashing about (10)

Ross

I believe the answer is:

parrotfish

'swimmer' is the definition.
(parrotfish is a kind of aquatic vertebrate)

'for his part splashing about' is the wordplay.
'splashing about' indicates anagramming the letters (I've seen this in other clues).
'for'+'his'+'part'='forhispart'
'forhispart' with letters rearranged gives 'PARROTFISH'.

I've seen this clue in The Independent.
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