Crossword Genius

Flounder perhaps in first half, somehow striker's finish missed (8)

Ross

I believe the answer is:

flatfish

'flounder perhaps' is the definition.
(flounder is a kind of flatfish)

I don't understand the remainder of the clue.

(Other definitions for flatfish that I've seen before include "Sole, plaice etc" , "Plaice or sole, for example" , "Swimmer" , "could be a fluke" , "Perhaps sole" .)

I've seen this clue in The Times.
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