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I've had clover take over patches of my yard and found that the most reliable fix is actually just accepting it at first - clover means your soil's probably low on nitrogen, so a decent fertilizer applied in spring and fall makes a real difference. If you want it gone faster, a selective herbicide targeting broadleaf weeds works, but you have to catch it before it gets too established. The annoying part is that clover seeds stick around forever, so you'll need to stay on top of it for a few seasons rather than expecting one treatment to solve it permanently.
The nitrogen angle is spot on, but don't sleep on the pH either - clover thrives in slightly acidic soil, so if you're liming to raise it toward neutral, you'll naturally squeeze out the clover while your grass gets happier. Fertilizer helps, yeah, but that pH adjustment is often the missing piece that keeps it from just coming back next season.
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