We don't have synonyms for cleanwell yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are clewell, cranwell and claywell.
"1653: Izaak Walton, The Compleat Angler - I'll now lead you to an honest ale-house, where we shall find a cleanly room, lavender in the windows, and twenty ballads stuck about the wall."
"1653: Izaak Walton, The Compleat Angler - I'll now lead you to an honest ale-house, where we shall find a cleanly room, lavender in the windows, and twenty ballads stuck about the wall."