"Now she's smilin' ear to ear / She's the headlights, I'm the ___" (4)

I believe the answer is:

deer

(Other definitions for deer that I've seen before include "Grazing animal(s)" , "Antler-bearing animal" , "Hoofed mammal" , "Ruminant mammal with antlers and hooves" , "Wild animal" .)

I've seen this clue in the USA Today.

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