ZINKE is a word for an old instrument, the "cornett" (Zink in German) ; take the tune ("air") from tuned which gives you the "d" and add C to the middle. I assume "filed" should be "fired"?
"Geese" and "tubes" can both mean idiots : put "no" in the middle and you get Italian townies (though I think it should be "Genoesi").
I don't understand COOF yet. In fact I don't understand most of the downs in the left half of the puzzle, so any help appreciated.