1: Crew member is one in operating room (3)
2: Drain off lowest part (5)
4: Jump all over Kegler, say (9)
5: Oak's first seen on the first of May with its leaves out (5)
6: I'm running into ill-humored statements (9)
7: Certain European in age-worn convertible (9)
8: Black arts and demons concerned with Homer's issue? (4,7)
11: Questionable realtor robs preacher (4,7)
14: Increases scales; ate sloppily (9)
15: Regrets taking thousands in with leader of suspiciously questionable nature (9)
17: He's on diet - ordering in addition to the main course (2,3,4)
21: Follow in broken suede shoes (5)
22: Test limits of sexologist in assignation (5)
23: Flower shop nosh about $41 (5)
26: 4-down Arias hit high note in some of the lungs (3,3)