Possible Clues:

• Scab
• Hit big wave, getting scab
• Scab, blackleg
• Blackleg hit right in mug
• Hit big wave, producing scab?
• Scab caused by blow wave
• Hit by wave, one labours on regardless
• Person who's really crossed the line
• Having hit wave, one hasn't come out
• One who won't go out with his brothers?