I've had two front end clunks and both exhibited the same phenomenon as yours... They would diminish for a period of time after the car was raised in the air. Anyway, one was a worn sway bar bushing, common. The other was a bad front ball joint. Third noise which didn't go away until fixed was a broken ball joint fixing bolt on the steering knuckle. That was a bitch to diagnose because there was no measurable play when the suspension was loaded. A local mechanic finally saw the broken bolt and replaced the knuckle for me.
Other culprits could be worn inner or outer tie rods, torn lower control arm bushings, or worn front strut top hats.
Anyway, good luck.