As with all clunks, you need to start searching for the source. Could just be a track rod end, or it could be a balljoint or even a strut top mount. A common source of such clunks when turning the steering is the top mount. There is a bearing between the top spring pan and the rubber mount which allows the spring to rotate with the steering. If these get sticky then the spring can jump round rather than rotate smoothly and cause a clunk.
Have someone view the spring while you turn the steering to see if it is turning stop start / jumping round, in which case you may need to replace the bearing / top mount. To check track rod end, get the wheel off the ground (safely - i.e. on an axle stand) and then try to rock the wheel when grabbing at the 3 and 9O'clock positions. You can also put your fingers on the track rod end- pinch the pin through the rubber boot and rock the wheel as described. Usually if it is the track rod end you will feel it here.
For a balljoint, same thing -wheel in the air, and then grab at 6 and 12 O'clock positions. Rock the wheel and see if you feel it. Again fingers pinching the pin of the ball joint through the rubber can help to identify it. Could also be the anti-roll bar drop link.
Just a case of working through the possibilities methodically.
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