Icing on the cake ... or a hint to 20-, 24-, 35- and 43-Across 14 letters

Crossword clues for Icing on the cake ... or a hint to 20-, 24-, 35- and 43-Across 14 letters:

FINISHINGTOUCH: Icing on the cake ... or a hint to 20-, 24-, 35- and 43-Across