would help to know what car as well. if you have a front lower sway bar the bushings could be worn causing a clunk.

but more then likely it is your cv boot. is it clicking? if it is clicking then it is outer cv boot. check for a rip in the boot. if there is a rip...then replace whole shaft. if it is one clunk and not clicking....check your inner cv boot....if it is ripped....replace whole shaft. please dopnt ask how to replace bc there are descriptive forums for this. look up westcoaststyle he has good diy forum on this subject. (yeah i am giving you props now for those if you are reading this...eventhough your one commet blew ass)