betty
70 is an anagram (bananas) of an archaic word no one except Chambers has ever heard of. Find 12 letters in the clue.
73 think odd post of the Bailey
93 The composer is Italian and Charlie is from the phonetic alphabet if that helps.
Pay off and buy off which I've considered are two words. In addition I have considered carrot, bounty , rebate, parole and others I didn't write down. But there must be an answer which fits the clue.