You and I accept silver payment (4)
I believe the answer is:
wage
'payment' is the definition.
(I've seen this before)
'you and i accept silver' is the wordplay.
'you and i' becomes 'we'.
'accept' means one lot of letters goes inside another.
'silver' becomes 'ag' (Ag is the chemical symbol for silver).
'we' enclosing 'ag' is 'WAGE'.
(Other definitions for wage that I've seen before include "Reward for work" , "Regular payment for work" , "Money earned" , "Salary" , "Regular amount of income" .)