For which one may offer a great deal (3)
I believe the answer is:
lot
'great deal' is the definition.
(both can mean a large amount)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for lot that I've seen before include "Nephew of Abraham - batch" , "one whose wife was backward-looking?" , "Item for sale at auction" , "Large amount; Abraham's nephew" , "Fate - plenty" .)