Related Clues:

• Undersea vessel (informal)
• Footlong, for one
• Teacher on call
• Quiznos sandwich
• Replacement torpedo vessel
• Undersea boat
• Dom's partner
• Periscope site
• Jersey Mike's offering
• Loan for boat
• Provide cover for places around India swamped by river
• Ship like Capt. Nemo's
• ... substitute messes it up, edgy about defending
• Work for press, taking public transport to north
• Substitute for topsy-turvy exercise in river