Left out spice as an act of kindness for a two-year period (6)
I believe the answer is:
favour
'left' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps there's a link between them I don't understand?
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for favour that I've seen before include "Goodwill - support" , "Approve of - indication of support" , "Go for" , "Grace and - denotes housing granted by queen" , "Prefer one over the other" .)