Possible Clues:

• One may have a member initially unreplaced, then get peg
• One who's had a limb removed in surgery
• Person with a limb severed
• Certain unfortunate vet
• One has to manage without all the members alas
• A male turning up needing support — Long John Silver, for instance
• Mate up at sea close to gunwale for Nelson, perhaps
• Lieutenant Dan, by the end of "Forrest Gump"
• Many an Amplitude Magazine subscriber
• Gangrene sufferer, maybe