Beginning of month: everyone is on parade (4)
I believe the answer is:
mall
'parade' is the definition.
(thesaurus)
'beginning of month everyone is on' is the wordplay.
'beginning of' suggests taking the first letters.
'everyone' becomes 'all' (I've seen this before).
'is on' means one lot of letters go next to another.
The first letter of 'month' is 'm'.
'm'+'all'='MALL'
(Other definitions for mall that I've seen before include "Shopping precinct" , "Covered complex of shops or path by a canal" , "Mercantile centre" , "Retail complex" , "Traffic-free street" .)