Customers with little money _ about £1 (7)
I believe the answer is:
clients
'customers' is the definition.
('client' can be a synonym of 'customer')
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for clients that I've seen before include "Stencil (anag)" , "Consumers" , "Customers of the professions" .)