Compromise solution
by Kegler

Each pair of conflicting letters gets replaced with the letter exactly halfway between them in the alphabet; in column order, the new letters spell MIDDLE GROUND.

Compromise solution grid

Across
1WOO(F)S
5SUB + S (rev)
10lAURA
12AP + EX (PA rev)
13tASKS
14WALE ("WHALE" hom)
16HER + E
17J + ADE
20LANDAU (2 defs)
23ED + IS + ON
24A + EON (ONE anag)
26DIS + TORT
27AMP(U)L (LAMP anag)
30HEM + P
33RE + ADER (DEAR anag)
36RESOLE (OR ELSE anag)
39A(RIA)S
40N(A)IL
41AYE ("EYE" hom)
42CO + IF + S
44OLLAS (hidden)
45QUITE (QUIET anag)
46W + ELDER
47RE(TE)ST
Down
1W + ARPED (DRAPE anag)
2lOcUsTs
3BARES (SABER anag)
4SAW (rev)
5S + PAWN
6B(L)EAK
7SWEDE (WEEDS anag)
8OK + R + A
9US + E
11RADISH (RAD-ISH pun)
15B + LIT + Z
18ADmIT
19TOO + K
21NAME (MEAN anag)
22UNL(A)CE (UNCLE anag)
25O(UT)LIVES
28PRO + FIT
29E(RENO)W (WE rev)
31P(RAY)ER
32RESCUE (SECURE anag)
34GRIL + L (GIRL anag)
35ERASE (hidden)
37SHOUT (SOUTH anag)
38BALM (LAMB anag)
43SET (last letters)