Crossword Genius

Stunning swimmer's thrilling fact needing correction somewhat? (8,7)

Ross

I believe the answer is:

electric catfish

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'stunning swimmer's thrilling fact needing correction somewhat?' is the definition.
I can't tell whether this definition defines the answer.

'thrilling fact needing correction somewhat?' is the wordplay.
'thrilling' becomes 'electric' (I've seen this in another clue).
'needing correction' indicates anagramming the letters (I've seen this in other clues).
'somewhat?' becomes 'ish' (eg 'amateurish' means somewhat amateur).
'fact' with letters rearranged gives 'catf'.
'electric'+'catf'+'ish'='ELECTRIC CATFISH'

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