Barile - it would be nice to know why the clover did not do well in that section before you plant again. It could be that section is to acidic for clover, or too dry.

If you want to overseed the area anyhow, mow its close to the ground first, then spray poast a couple days later (roundup would be better - it would kill everything there - but the poast should work). Broadcast 8-10 lbs/acre of clover - do not use a drill- It does not sound like you do not need to apply fertilzer but without a soil test there is no way to know.

Lastly - be prepared for the clover to not come in well, hopefully the grasses just overtook the plot, but it could just as easily be that the Ph in that section of the field is too low and needs lime.

good luck