Across

• 1.

  Young, gung-ho test pilot (6)
• 5.

  Sheet Catherine the Great's successor found in lake (9)
• 11.

  Italian city shelter accepts beggar finally (5)
• 12.

  Trouble with snake in saint's vessel (8)
• 13.

  Chip in in different ways by proxy (11)
• 14.

  Expert help assumes six conditions (8)
• 15.

  Tree line article (5)
• 18.

  Leaving money for tip due (8)
• 19.

  Southern colony of the Soviet Union seemed cold (8)
• 20.

  South African land of birth (5)
• 24.

  Not at all fit to be seen on the inside (5)
• 26.

  Most green flies eat on the move (8)
• 29.

  Shakespearean figure's grasping the materials (8)
• 31.

  Pound egg into gun and rub it in (5)
• 33.

  Identical seeds divided by large female (8)
• 35.

  Strong wind has dislocated hornet and flower (11)
• 36.

  In fun, poorly disguise doubt (8)
• 37.

  Enter buggy made of wood (5)
• 38.

  Circle pitch about deal for medical instruments (9)
• 39.

  Number one trap in New York (6)

Down

• 1.

  Second appearance of reactionary group in House of Representatives (7)
• 2.

  Sleep-inducing drama from Japan about car developed by jerk (8)
• 3.

  French king swimming Rhine (5)
• 4.

  Performer, in part, is talented (6)
• 5.

  Leave volume with a member of a fraternal order (7)
• 6.

  Serialized story about one piece of earth's surface (8)
• 7.

  50 caught in storm aboard ship (7)
• 8.

  Dopey scheduled around major conflict (hyphenated) (4-6)
• 9.

  Headdress of one in Gone With the Wind scene (5)
• 10.

  Catch ten flying fish (8)
• 16.

  Hindu spirit claims ruins (10)
• 17.

  Descartes pursues island goddess (5)
• 18.

  Intimate apparel is resurrected? (6)
• 20.

  Nothing the way it appears in common mirage (5)
• 21.

  For Lent, bail out trial participant (8)
• 22.

  Exceed 1.067 kilometers, breaking old record (8)
• 23.

  Poke fun at guys top to bottom for convenience (8)
• 25.

  Toast heroic stranger, gulping last of champagne (7)
• 27.

  Bill permits plaques (7)
• 28.

  All year following Mock Turtle (7)
• 30.

  Spanish agreement about a remote expedition (6)
• 32.

  Hood shot out after word from a гаррег (5)
• 34.

  German city being neutral (5)