Crossword Puzzle Nod backwards?

Clue: Nod backwards?

Nodding picture? (IMAGEOFCONSENT with 14 letters)
Go backwards (REGRESS with 7 letters)
Backwards, and key to this puzzle's theme (INREVERSE with 9 letters)
Nods, maybe (ASSENTS with 7 letters)
"Even Homer nods" writer (HORACE with 6 letters)
Noddy (TERN with 4 letters)
Nodded messages (YESES with 5 letters)
Backwards duplicate (MIRRORIMAGE with 11 letters)
Backwards (e.g. ABACK with 5 letters)
They Might Be Giants song with the line "And her voice is a backwards record" (ANANG with 5 letters)