Customers given right box on fourth of March (9)
I believe the answer is:
clientele
'customers' is the definition.
(I've seen this before)
'given right box on fourth of march' is the wordplay.
'given right' becomes 'lien' (legal right. I am not sure about the 'given' bit.).
'box' becomes 'tele' (I've seen this in other clues).
'on' is a charade indicator (letters next to each other).
'fourth of march' becomes 'c' (nth letter of 'march').
'lien'+'tele'='lientele'
'lientele' after 'c' is 'CLIENTELE'.
Can you help me to learn more?
(Other definitions for clientele that I've seen before include "Customers of professional service" , "Patrons" , "customers round" , "They patronise" , "Customers of a business" .)