Right, so "lines" at the end is your definition — a rondeau's a verse form, made up of lines. Now for the wordplay: "neither partner" points you to NOR (that's the word that pairs up with 'neither'), and "recalled" tells you to flip it round, giving RON. Then "mentioning bread" is the homophone bit — say 'dough' out loud and you get DEAU. Stick RON and DEAU together and there's your answer.