The perimeter quotation was defined by redundant words in the first clue type. Redundant words in the second type gave its source: Holy Sonnet: At the Round Earth’s Imagined Corners (by John Donne). As the corners were to be imagined, the corner letters of the grid (W, R, E, N – hence The Invisible Wren) were ignored in wordplay in the remaining clues.
8 ENO(W); one (rev.)
9 SOREDIA; sore dia(l); conflict = WAR
10 SPRAINING; S P raining; holy
11 NOSERS; ser. in son (rev.); sonnet
13 ALIMENTATIVE; anag; want = DEARTH
17 CHEESE-RE(NN)ET; cheese + anag.
19 P(R)EPAY; PEP ay
21 AUBRETIAS; anag. + sai (rev.); mature = AGE
22 LOOK-SEE; loo + s(IX) in kee(p); at
23 FL(E)A; fla(n)
1 ANGOLA; an + a log (rev.); fevers = AGUES
2 ROBS; hidden; the
3 EXPRESS(N)ESS; expresses s
4 ROASTS; as in rots; autocracies = TYRANNIES
5 TRILATERALS; anag; round
6 ADIPIC; pi in anag; earth’s
7 GINN; g inn; gloominess = DESPAIR
10 S(E)MP(E)R; rpm’s (rev.)
12 STONES; on in set’s (rev.); act = LAW
14 JE(R)BOA; je BO a
15 SETTEE; set tee; imagined
16 (W)EAKEN; anag.
18 EUOI; e + IOU (rev.); risk = CHANCE
20 PALI; pal I; corners
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