My take on this is that if you spray the weeds - and plenty of dirt is exposed -DO NOT disk it again before you plant - just overseed the clover and roll it in.

Were the beans RR Ready type last year? If so - grasses are probably few in the field now and lots of dirt is exposed - if so - clover out competes most annual weeds. - you may not need to spray at all - just seed it and roll it in.

If I'm not sure - I disk it real good - roll it - seed it - then roll it again. You cannot plant clover too early - in fact the earlier the better - even if some frosts may come along.

A firm seed bed is essential for clover - as well as the seeds being "pressed in" - not disked in.

FH