There's growing interest in what the council may offer (9)
I believe the answer is:
allotment
'offer' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for allotment that I've seen before include "share in growing concern?" , "Portion, distribution" , "grant?" , "Small rented gardening plot" , "patch" .)