The Magic Flute
by Kegler

Fifteen answers get modified before entry; 26 Across identifies the responsible party.

The Magic Flute grid

Across
1Surgical instrument starting to penetrate gown
5Adjusting heat aboard train somewhat
8We hear singer Natalie is black?
12Time out, receiving ball before end of every half
14Printed mistakes are holding sailor back
15Certain flyers eventually see nurses
16Barker hugs German actor George
17Observes Beetle cars crashing
19Rebukes retreating Southern soldier running east
20On a roll following second chance
22He's back, taking time for Adam's son
25Spoke to dear Dotty
26See instructions
29Lieutenant, gaining one pound, quit certain weight-loss program (2 wds)
31Disney packaging Greek character in wood
32Reagan's acquiring a couple of time-shares
33Additionally including one date for liqueur flavoring
36Brain, perhaps, from wild orang
39Tells of headset arranged backwards, in part
41One Democrat gets into backing conservationist element
42Automaton designer Christian's genetic make-up reflected
43Start the bidding for old writing instrument
44School official upset about prank ultimately is exposed
45Troupe assessment is emasculating
Down
1Steals crowns containing iridium
2Indians love wise men
3Second-rate painters reproduced jewelry
4Listening devices entrapping fifty members of the nobility
5Boss hit on comedian Margaret
6Ignoring the odds, Hermes dashes
7Trollop damaged certain desk cover
8It reacts badly with some acid salts
9Apparatus tendering money, primarily!
10Developed realty shaped like an instrument
11Reportedly, come out of the water like a whale's rump
13Plant in northern Maine garden plot
18Trimming and reinforcing about ten
19Certain African boy, almost brown, catches bird
21Ms. Hawn dropping $1000 for blast from the past
23Corners Republican surrounded by supporters
24Mistakenly quit, per a clearance from a port's health authority
27Rambling and imploring, having a change of heart
28Disallow one piece of atrophied fruit
30More than one electronic device fails, absorbing more than can be handled
34Father Junipero essentially grateful for having teeth
35Wandering one climbs inside rocky crater
37Successful comic's interest in nonsense
38Unusual name for the last word?
40Parties coming up with grass

Solution