Solution to Replace by Curmudgeon

 Replace by Curmudgeon - Solution

LIMA

Across clues anagrammed to cities with an additional letter with the first six extra letters giving CITIES. Solvers had to write LIMA (Peru's capital) below the grid. Cities included below with wordplay – extra letters shaded in the solution grid.

Across: 1 Rocky, 5 Port wine, 10 Tiercelets, 11 Heretics, 14 Niece, 15 Relish, 16 Ormer, 17 Rabats, 20 Mossy, 21 Emong, 23 Intuse, 26 Noles, 27 Lassoed, 28 Grana, 29 Slum, 35 Lyte, 37 Roti, 40 Hoard, 41 Nepalis, 43 Repoints, 45 Romanced, 46 Soger, 47 Slake, 48 Inchworm. 

Down: 1 Rehirings, 2 Operator, 3 Kiel, 4 Yeti, 5 Priss, 6 Rest, 7 Weirs, 8 Items, 9 Exerted, 12 Rebel, 13 Chug, 14 Noons, 18 Amen, 19 Tosa, 20 Miaul, 22 Nosed, 24 Tsar, 25 Sei, 30 Lenten, 31 Mopish, 32 Colugo, 33 Disarm, 34 Sheol, 35 Lop, 36 Trine, 38 Tiger, 39 Errs, 42 Avow, 44 Oak. 

Across: 1 YORK: Double definition, 5 NEWPORT: {INEPT ROW}*, 10 LEICESTER: TIER + SELECT*, 11 CHESTER: HERE + TICS, 14 NICE: E(ye) in NICE, 15 REHLI: Double definition, 16 ROME: FORMER less F(ound), 17 RABAT: Hidden rev., 20 MOSS: MO (bus)Y around SS, 21 NOME: E MONG, 23 TUNIS: (l)IN(t)  (migh)T USE, 26 LEON: NO LES(s), 27 ODESSA: LED aroud ASS O, 28 AGRA: AN ARG(ument)<, 29 ULM: L in SUM, 35 ELY: Hidden, 37 RIO: ROT I, 40 DOHA: HARD round O, 41 NAPLES: ALPINES*, 43 PRESTON: RE POINTS, 45 CREMONA: ROMANCE D, 46 OGRE: SO GER, 47 ALES: S LAKE, 48 NORWICH: FINCH less F + WORM. 

Down: 1 RE (pus)HI(est) RINGS, 2 [w]ATERPROO[f]*, 3 "KEEL" heard, 4 Hidden, 5 PR IS S(uch), 6 HIDDEN, 7 WEIR(d) S, 8 MITES with M dropping, 9 EXETER: EXASPERATED* less ASAP*, 12 Hidden, 13 C HUG, 14 NO(w) ON S, 18 MEAN*, 19 TA round OS, 20 LIMA: MUSICAL* less C(acophonou)S, 22 SON< + ED, 24 (elec)T + RAS<, 25 DIES less D<, 30 LENT (m)E(a)N(s), 31 M OP IS H, 32 COO around  L U G, 33 DIS ARM, 34 SHE O L, 35 Double definition, 36 Double definition, 38 TIER round G(ymnastics), 39 (t)E(r)R(o)R(i)S(t), 42 A VOW, 44 (M)O(h)A(w)K(s).