Elk dropping guts in grass smelled bad (6)
I believe the answer is:
reeked
'smelled bad' is the definition.
(reeking is a kind of smelling bad)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for reeked that I've seen before include "Smelt strongly" , "Smelled strongly as of drink" , "Smelled strongly and badly" , "Was foul-smelling" , "Fumed" .)