Initially mixed with everybody in shopping area (4)
I believe the answer is:
mall
'shopping area' is the definition.
(I've seen this before)
'initially mixed with everybody' is the wordplay.
'initially' indicates taking the first letters.
'with' is a charade indicator (letters next to each other).
'everybody' becomes 'all' (I've seen this before).
The first letter of 'mixed' is 'm'.
'm'+'all'='MALL'
'in' acts as a link.
(Other definitions for mall that I've seen before include "Covered shopping centre" , "Sheltered walk or promenade" , "Retail complex" , "Traffic-free street" , "Glowing material in fire" .)