There's a lot he wants (6)
I believe the answer is:
bidder
'there's a lot he wants' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'lot he wants' is the wordplay.
I cannot quite see how this works, but
'lot' could be 'd' and 'd' is present in the answer.
'he' could be 'der' and 'der' is found in the answer.
The remaining letters 'bi' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for bidder that I've seen before include "One at auction" , "He makes an offer at auction" , "One offers" , "Offerer" , "Participate in an auction" .)