Some ore? A good deal, by the sound of it (4)
I believe the answer is:
lode
'some ore?' is the definition.
(lode means a vein of ore in the ground)
'a good deal by the sound of it' is the wordplay.
'a good deal' becomes 'load' (both can mean a large amount).
'by the sound of it' shows a homophone (sound like).
'load' is a homophone of 'LODE'.
(Other definitions for lode that I've seen before include "mine to some extent" , "Deposit of valuable ore running through other rocks" , "Vein of metal in the earth" , "Rich source" , "Vein of metal ore in surrounding rocks" .)