Stone container turned upside down to get seasoning (6)
I believe the answer is:
nutmeg
'stone' is the definition.
The definition and answer can be both plants as well as being singular nouns.
Maybe you can see an association between them that I don't see?
'container turned upside down to get seasoning' is the wordplay.
'container' becomes 'tun' (tun is a kind of container).
'turned upside down' says the letters should be written backwards.
'to get seasoning' becomes 'meg' (I can't explain this - if you can you should give a lot more credence to this answer).
'tun' in reverse letter order is 'nut'.
'nut'+'meg'='NUTMEG'
Can you help me to learn more?
(Other definitions for nutmeg that I've seen before include "Kernel and girl for a spice" , "Spice to grate" , "Aromatic seed - met gnu (anag)" , "Men gut this herb badly" , "Give out light" .)