Possible Clues:

• People who row, terrible moaners
• Guys on a crew team
• Eight in a row?
• People who row may be married, within reason, when upset
• Preserving energy, Romans relaxed -- slaves driving galley, maybe
• Warning to pull in behind docked boat crew?
• Strokes, say, one's arm when agitated
• Guys in a regatta
• Scullers
• Crew — moaners (anag)