Answer:

finder

Answer	Crossword Clue
FINDER	Keeper, so it's said
FINDER	Keeper, according to a saying
FINDER	Successful searcher

FINDER	Discoverer.
FINDER	Camera attachment.
FINDER	Camera device.
FINDER	Camera part.
FINDER	Detective, essentially
FINDER	Locator
FINDER	One earning a fee, maybe
FINDER	Detective, at times

FINDER	He's a keeper, according to an adage