Fireplace schmutz (5)
(Other definitions for ashes that I've seen before include "Former Wimbledon champion's" , "Eng/Aus test series" , "''... to ..., dust to dust'' (burial service)" , "trees" , "Remains from a cremation" .)
(Other definitions for ash that I've seen before include "End of fire" , "It's used for flooring" , "Tree in danger" , "Timber tree" , "deposit" .)