Here’s the Solutions grid

Colouring the “O”s in the grid, and also all white islets in the red sea (the blocks in-between), yielded a giant red heart.

Find the shape again in the grid and colour it red” was the instruction to identify that the solution for 44D was “Heart” and to colour that answer red as well..”

Here are the Annotations:

Across: 1 (CASHMACHINES-(MECHANICS)*)*, 4 Telescopic, 7 US E, 9 (RECAPTURED-CRATE*)*, 10 AS HEN, 11 Acrostic &lit, 12 CAMera, 13 POLICE-POL, 14 WOrKing, 15 DD, 16 YOUng, 17 DON<, 18 (AUTOMOBILES-MUESLI*)*, 20 (US ZOO)*, 22 SOb, 25 pOrK, 27 HOOP* around T, 29 (SAGO-O)*, 31 OZO(N)E* it’s over the South Pole, 33 Telescopic, 34 CYRIL* A L, 35 LEEch, 36 CD Two’s company, 37 DD, 38 ISIS/2=IS, 40 GOaT, 42 (BOATING*-AINT*), 44 HErod, 45 BOREMY*, 49 (TROLLEYBUS-BULL*)*, 52 Telescopic, 53 (cuBeROOT)*, 54 PrEpAyS, 55 PESTS*, 56 Telescopic, 57 (WASpS* around T).

Down: 1 HA(PP)Y, 2 TOURS* around P, 3 CD, T<, 4 C dUCK OO, 5 BA(M)BOO, 6 Sad HOWl, 7 (NUCLEAR FUSION*-CAREFUL*)*, 8 EM END, 19 B(OILOG*)oY, 21 (OOZY LOG)*, 22 S P ICIER, 23 HOMe*, 24 TRAIN-RN, 25 Half of 2 (answer to clue 36), 26 CD,DD (finders are keepers), 28 O P T, 29 (TIGeR)*, 30 SCAB*, 32 Telescopic, 39 TRAMS<, 41 OO RT, 43 OO T Y, 44 H EAR T, 46 febBruary januarY, 47 RS VP, 48 (HOUSEBOYS-HUSSY*)*, 50 Telescopic, 51 noTE.

Here’s the link to the “Hall of Fame”

Thanks to “The Oracle” for this enjoyable puzzle and to all of you who participated.