Wiki agrees with you. Though I disagree with its level 2 and 3 hunters... I think they're actually the level 1 and 2 hunters, and the zombie huntin' feller (who isn't mentioned on the wiki at all) is the level 3 hunter. But yeah, Wiki says that clovers are once per day. Since they're completely free, I think if you collect breakfast...
Not quite: I encountered the zombie huntin' feller after McGruber on one character, and not yet on another (who happens to have just defeated the relivinator).
edit: see http://kol.coldfront.net/thekolwiki/index.php/Talk:Zombie-huntin'_feller ; could be a daily thing (after day 1), but is definitely not first turn of the day (first char encountered him about 90 turns into day 2). Interesting, could be TPTB's way of making runs easier for less experienced players? Dunno.
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