Possible Clues:

• Living off another
• Living off others
• Freeloading act is a rip-off
• Served up first in cinema, it is a clip of a bloodsucker
• For a sucker, this sounds sort of Parisian, perhaps
• Having food provided by host Is it a carp, perhaps?
• Like mistletoe to be paid for by someone else
• Like mistletoe, it is a hit when put up, caught underneath
• A soldier thus hangs on to it like a leech
• Living at the expense of the host organism