There's a lot on offer here (7)
I believe the answer is:
auction
'offer here' 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?
'there's a lot' is the wordplay.
I cannot really understand how this works, but
'there's' could be 'n' (I've seen this in other clues) and 'n' is found in the answer.
'a' is found in the answer.
'lot' could be 'c' and 'c' is found in the answer.
This explanation may well be incorrect...
'on' acts as a link.
Can you help me to learn more?
(Other definitions for auction that I've seen before include "Caution about method of sale" , "Competitive sale" , "event with lots involved" , "Public bidding sale" , "Public sale with lots" .)