The balance negotiated in sterling, partly (4)
I believe the answer is:
rest
'the balance' is the definition.
(I've seen this in another clue)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for rest that I've seen before include "Slumber" , "Take a breather - (the) others" , "Change is as good as this, they say" , "'''God ... ye, merry gentlemen'' (carol) (4)'" , "Relax, take a break" .)