Relationship by Aedites

Puzzle explanation

Corrections to misprints in clues spelt “diameter is inside a circle”. A circle of RADIUS ONE (the diameter highlighted in the grid) has an AREA THREE POINT ONE FOUR ONE FIVE (the highlighted circle), if π is truncated rather than rounded to 4 decimal places.

The puzzle was published on what has come to be known as “pi day”, as in US format the 14th of March is 3/14, the initial digits of π. In fact this particular day had an instant where the month, day, abbreviated year and time represented π exactly, ie, 3/14/15 9:26:53.589793….

Clue explanations

Conventions: * = anagram, < = reversal

No Misprint Answer Explanation
Across
1   EFFACE EF + FACE
7   ACCESS AC + CESS
12   PALLONE (ALL’S ONE − S) after P
13   FORGOT FOR + GOTH − H
14   ISATIS ISIS around AT
15   CLOUD CLOU + D(ominates)
16   ALEUT ALE + UT
18   CREE CREEL − L
19   SIRIH IRISH with S moved to the front
22   NITINOL NIL around (TIN + O’)
23   WORRIED WED around ORRI(s)
24   SWAIN SWAN around I
26   SPRAD S(u)P(e)R (h)A(r)D
29   ONE-ER PIONEER − PI
30   EMBER (m)EMBER
31   MORTIFY MORT + IF + Y(ou)
34   CETACEA (CECA − C) around TACE
36   DALIT DAL + IT
38   ERRS SERR with S moved to the back
39   DREAM (ER in MAD) <
42   CHANT CHANTAGE − AGE
43   GREECE (a)GREE + CE
44   VELETA VALETE with A and E exchanged
45   ERASERS (ER + ASTERS) − T
46   ASIDES IDES after ÅS
47   ANTRES ANT + RES
Down
1 o(D)es EPICS SPICE *
2 part(I) FASCIO ASCI in FO
3 T(A)rt FLAN FLAN(k)
4 pri(M)e ALTAIR ALT + AIR
5 Twin(E) COIL CO + IL
6 (T)rade SECUNDUM ARTEM (MATURE MEN SCUD) *
8 committe(E) CO-OPT COOP + T
9 ca(R)p CRUCIAN N after CRUCIA(l)
10 b(I)g SOMEONE SOME + ONE
11 (S)evere STEELER STEER around EL
17 f(I)rm TISSOT T(eacher) + TOSS < after I
20 Ski(N) HIDE (t)H(e) I(n)D(i)E(s)
21 pa(S)t LEIRED LED around IRE
25 H(I)nt WORD W + ROD *
26 (D)isused SUCEAVA CAUSE * + V + A
27 Ga(E)lic PEERIES PS around EERIE
28 (A)idos ABASHED ABA + SHED
32 (C)alm TAMEST TAM + EST
33 tax(I) FIACRE AC in FIR + E
35 ca(R) CRATE C + RATE
37 Lo(C)k TRESS STRESS − S
40 woo(L) ARAN A + RAN
41 whe(E)l VEER REEV(e) <
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