Customers (9)
'customers' is the definition.
('client' can be a synonym of 'customer')
This is the entire clue.
(Other definitions for clients that I've seen before include "Customers of the professions" , "Consumers" , "Stencil (anag)" .)
'customers' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for clientele that I've seen before include "They patronise" , "Customers of professional service" , "customers round" , "Customers of a business" , "Patrons" .)