Here are the possible solutions for decisive time or theme of this puzzle clue
Answer
Clue
Relevancy
dday
Clue
Decisive time (or theme of this puzzle)
landslide
Clue
Decisive victory, and any of four features of this puzzle
Definition
to win an election by a huge majority
info
Clue
Theme word inside this puzzle's theme words
Definition
(short for) information
lllllllllllllllllllll
Clue
Much of the Smurfs' theme song, and this puzzle's theme
rawhide
Clue
Classic TV theme song covered by this puzzle's theme duo
Definition
to beat with a type of whip
four
Clue
Number of times this puzzle's theme word appears diagonally in the grid (to complete the puzzle, shade those words plus the Down answers that begin where they meet)
Definition
the cardinal number next above three
skewedtooneside
Clue
Like this puzzle's theme, to solvers concerned with puzzle symmetry?
wordladder
Clue
Puzzle invented by Lewis Carroll (and a hint to this puzzle's theme)