Really, Chris? Each to their own. I enjoyed the literalness of the second half of the clue. Which regular crossworder wouldn't look at 'home' and think, 'Ah, the answer must include 'in' somewhere'? Then try to figure out what to do with 'moss'. So, when the penny dropped that you're just looking for something that actually does make a home out of moss, I thought, 'Brilliant.'