Here are the possible solutions for this puzzle's key theme word clue
Answer
Clue
Relevancy
middlec
Clue
Important key (and key to this puzzle's theme)
info
Clue
Theme word inside this puzzle's theme words
Definition
(short for) information
gif
Clue
Oxford American Dictionary's 2012 word of the year, and the key to this puzzle's theme
Definition
a type of computer image
ice
Clue
This puzzle's key theme word
Definition
to cover with frozen water
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
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
class
Clue
Plane seating division (and the key to this puzzle's theme)