Refuse to help in gardening? (7)
I believe the answer is:
compost
This clue might be a double definition.
'refuse' is the first definition.
The definition and answer can be both substances as well as being singular nouns.
Maybe there's an association between them I don't understand?
'in gardening?' is the second definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.
'to help' acts as a link.
Can you help me to learn more?
(Other definitions for compost that I've seen before include "Decaying vegetation as fertilizer" , "Decayed organic matter" , "Garden fertiliser" , "Decayed organic fertilising material" , "Fertiliser (from heap or bin)" .)