This comes up from time to time. The answer is currently "no, you can't run clusterize from the plugout_drive". That said, you could run 3dclust or 3dmerge on your data, and display that output of those tools in the AFNI viewer using plugout_drive to set the appropriate p-value threshold.
Previous Threads:
[
afni.nimh.nih.gov]
[
afni.nimh.nih.gov]