Possible Clues:

• The sole isn't the sole one
• Flounder perhaps in first half, somehow striker's finish missed
• Halibut, for one
• By the sound of it, might be a place at the bottom
• The sea might be the sole place for the sound of it
• Plaice, for example
• 'Fluke' — Gordon's description encapsulating explosive fit?
• Fit badly in fancy sole, say
• Perhaps 22-across for tea say, if back in a jiffy
• Swimmer twisted one foot, caught in a rush of water