From label:
Replanting: Do not plant alfalfa or clover for 4 months following a Willowood Imazethapyr 2SL application,
if replanting is necessary to a field that has been previously treated with Willowood Imazethapyr 2SL. Refer
to the ROTATIONAL CROP section of this label for plant-back intervals of crops.
So it looks like Imazethapr is not an option for now with 4 month waiting period for replant? Next time I can get away from Ida cleanup I will go try mix of 10 gallons water , 16 oz Clethodim with 16 oz %41 glyphosate and 13 oz surfactant for 1 acre plot. Hope these are correct amounts as no time to slow play weeds this year. Many times over the last 4 years of learning plotting I have read "you can't grow perrennial clover in the south because of the heat". But it is not the heat, the clover is actually fine, its the crazy aggressive weeds that are the challenge.
Throw n mow with clethodim like you wanted to do with imazethapyr in your first post, then hit the Johnson grass with imazethapyr 2sl once the clover is established.
I regularly interseed fall rye and spring oats into my clover as much for it's grass suppression and soil balancing as I do for deer feed. Small grains into clover is the poor man's herbicide application.
So with my clover plots I'm always looking for a 3-4 month window of time do one of these following four things (because they can't overlap): cleth, imazethapyr, oats (spring) rye (fall), and sometimes Butyrac200 as well. Overseeding more clover goes on with the small grain as necessary. A mowing often proceeds or accompanies each one of these processes. If it sounds complicated it really isn't, clover is very low maintenance crop, any one of these applications only takes an hour or less per acre from start to finish and 4 months doesn't come around often.
Practice, trial and error, staying off the field when its hot and dry, mixing it up with a different herbicide at every application are some of the keys to nice clover.