Possible Clues:

• Bore in a French river
• Did not go enough and suffered for it
• Experienced promoters of security on river
• One who did not make enough of a go of it suffered for it
• Did not go enough, maybe and suffered for it
• Experienced; bore
• Experienced, bore
• Did not go enough, it seems - just suffered
• Didn't go enough to have endured this
• Experienced university oarsman's back on river