Answer:

shimmer

Answer	Crossword Clue
SHIMMER	Shine, as sunlight on water
SHIMMER	Appear to vibrate in the heat
SHIMMER	Wavering image

SHIMMER	Tremulous glow
SHIMMER	Glisten
SHIMMER	Gleam faintly.
SHIMMER	Vibrate, as with heat waves
SHIMMER	Shine with a flickering light