It may well do, but it's not a definition supported by Chambers.
The component parts of the actual answer are, but I agree it's a very misleading and problematic clue. Nothing to do with sweeps or tiles, exactly, but everything to do with vituperate, synonymous with a well-known and usually Welsh product.
It's also possible to construe the clue as a word meaning honest + b (black) + guard = reak (syn with care/guard), which leads you up yet another garden path when it comes to the last syllable.
I'm not sure whether Dumpynose has been inspired, confused or unlucky here.