Loose freehub

There's been a knocking noise each time I pedal down with my drive side. I replaced pedals because there was a bit of play on the drive side pedal. Give out, knocking is still there. Checked bottom bracket, there's no movement. Removed it and cleaned it. I've realised the cassette has a bit of play as though it's loosely attached. I took cassette off and . Cleaned it. However the movement is the the free hub on the hub. Can I fix that or do I need a new buy a w hub orheel? Basically I lay he wheel flat and can wiggle the fly wheel. Think this is the cause of my knocking.
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There are no fly wheels on a bike. What are you moving?
Parktools :?:SheldonBrown
Any ideas?
There is no secret ingredient - Kung Fu Panda
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Parktools
So yes and no.
Strip it down and you will soon know and your lbs will now beable to ID what body you now need if it is not serviceable.
Parktools :?:SheldonBrown