Molten lead and everything in shopping area (4)
I believe the answer is:
mall
'shopping area' is the definition.
(shopping mall)
'molten lead and everything' is the wordplay.
'lead' suggests taking the first letters.
'and' means one lot of letters go next to another.
'everything' becomes 'all' (all things).
The initial letter of 'molten' is 'm'.
'm'+'all'='MALL'
'in' acts as a link.
(Other definitions for mall that I've seen before include "Covered shopping centre" , "Mercantile centre" , "Shopping facility" , "Shopping precinct" , "Traffic-free street" .)