1: Infection leads from partly uncooked steak (3)
 3: Run around near a stadium (5)
 6: Reportedly is nostalgic for wife (3)
 7: Bird and man going different ways (9)
 8: Neil lost a letter and ended up with nothing (3)
 9: Fiber extracted from thistles (5)
 11: Belated top-and-tailing to gladden one's heart (5)
 12: Nothing we have to pay (3)