Crossword No. 2777: 15 Down by Ploutos

Title
Highlight the line below this, to reveal the real title:
Thor

The puzzle was published under the name “Plutos”, but this was a definite error.

Symmetry: 180 degree

Size: 144 cells

Theme:
Six unclued across lights are past editors of The Times (= The Thunderer = THOR), celebrating its 200th anniversary; Unclued down lights contain two Cs and are still words if they are removed: ACCURATE, BACCY, CALCINE, CRESCENT and SCONCE.