18: First head of Homeland Security
19: Breezing through, as an exam
29: Whistle-blowers, of a sort
30: Block passage through
39: 'Inhabitant' of some tequila bottles
42: Batman foe Poison ___
43: Lewis Carroll's 'Jabberwocky' word for 'scratch, dog-style'
52: Ending of many WWW addresses
60: '... and baby makes ___'
62: Along the line of rotation
68: Extinct flightless bird