As felled with a loud cry? (6)
I believe the answer is:
timber
'as' is the definition.
The definition and answer can be both substances as well as being singular nouns.
Perhaps you can see a link between them that I don't see?
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for timber that I've seen before include "Watch out for falling tree!" , "Ash perhaps" , "Wood that's been cut and prepared" , "Mind the falling tree!" , "wooden" .)