Burnt remains (3)
'burnt remains' is the definition.
(remains of a fire)
This is the entire clue.
(Other definitions for ash that I've seen before include "It's used for flooring" , "One [TYPE OF TREE]" , "Grey-barked tree" , "... for this maybe" , "Residue after burning" .)
'burnt remains' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for ashes that I've seen before include "Powders remaining after fire" , "Embers" , "Remains of the Yule logs?" , "''... to ..., dust to dust'' (burial service)" , "Remains of anything burnt" .)