Don’t Get ’Em Wrong by Ploy

Puzzle explanation

The indexed letters in clues spelt “isolated system; conservation”. Treating the whole puzzle as an “isolated system” with the principle of conservation to be obeyed, the letters of MASS were “conserved” by removing them from some clues and adding them to other clues’ answers to make the grid entry. Conversely, the letters of ENERGY needed to be inserted into clues and omitted from answers. The conservation requirement resolved possible ambiguities in the grid entries for 5ac and 28dn. The puzzle’s title referred to the symbols E = energy and m = mass (given in their conventional case).

Clue explanations

Conventions: * = anagram, < = reversal

No Letter [added]/(removed) Answer, letter [added]/(removed) Explanation
Across
1   TARIFF TIFF around (A + R)
5   PAL[M]ATE PALATINE − IN
11   SP(R)ANGLE GENERAL-PURPOSE * − EUROPE *
13 (S)uppers SNAB BANS <
14 [Y]ore ETEN (secr)ET EN(clave)
15   LEXIS IS after (L + EX)
16   UNIO (j)UNIO(r)
17 Tub[E] SLEEVE SLE(epy) + EVE
19   OSCULA (OSCULA + SET) * = (LOST CAUSE) *
20   C(E)RISE CERE around IS
22   ENEWS (brav)E + NEW + S
24 prim[E] ASHLER HAS * + (f)LE(u)R
26   REDRESSAL (LASS + HERDER − H) <
29   ERRAND ERR + AND
32   OMASA O + MASA
34 dance(S) ACNED DANCE *
37   CHI[S]EL C + (s)HIEL(d)
38   PHLEGM LAMPLIGHTER * − TRAIL *
39   ESDA (Hu)E’S DA(rkened)
40   VISTO VISITO(r) − I
41 [G]rowers AÇAÍ (s)A(c)C(h)A(r)I(n)
42   REEL RE + E(wel)L
43   SINITIC (I + ISN’T) * + I/C
44   BARISTA B + ARISTA
45   C(Y)ANINE ANY * in CINE
Down
1 be(A)st TSESSEBE ESSE in BEST *
2   APTLY (A + PLY) around T
3   INNERWEAR (w)INNER + WE AR(e)
4   FLEERER FLEER + E + R(oute)
6 late[R] AGIOS ADIOS with G for D
7   LISSES SESSIL(e) <
8   ANNUAL NU in ANAL
9   TAILLES[S] ILL in SEAT <
10   E-BOAT (TO BE A) *
12   EXCITEDNESS (DECENT SIXES) *
18   EG(G)ER (bootl)EGGER
21   CHAMPLAIN PLAIN after CHAM
23   NORTH SEA HORNETS * + A
25   REARMICE REARM + ICE
27   SCEPTIC PECS < + TIC
28   LA(N)CE (g)LANCE
30 (M)any RAIDER I’D in REAR <
31 ski[N] NAEVUS NAE + V + US
33   ACERB ACE + BR <
35   CLI(E)NT CT around LIEN
36   [A]GAIN 2 meanings
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