He has lots to sell (10)
I believe the answer is:
auctioneer
This clue might be a double definition.
'he has lots' is the first definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'sell' is the second definition.
(I know that auctioneer is a more specific form of the action sell)
'to' is the link.
Can you help me to learn more?
(Other definitions for auctioneer that I've seen before include "One inviting bids for lots" , "one that has lots to offer" , "One selling lots" .)