Answer:

waning

Answer	Crossword Clue
WANING	On the decline
WANING	Approaching the third quarter, say
WANING	Like a last-quarter moon

WANING	Diminishing
WANING	Decreasing in intensity
WANING	Declining in power
WANING	In decline
WANING	Declining
WANING	Growing faint.
WANING	Going down.
WANING	On the way out

WANING	Like some moons
WANING	Petering out