1. sway bar bushing if it clunks over a bump/pot hole (try taking them out, putting them back and see if it's still there-cheapest fix if this will work)
2. end links if it clunks over any bump/pot hole
3. lower ball joint if it clunks over a bump/pot hole while turning
4. try control arm too.
5. i guess it's a blow strut
jack up the car