Half a dollar, note, is not a lot to pay (4)
I believe the answer is:
dole
'not a lot to pay' is the definition.
I can't judge whether this defines the answer.
'half a dollar note' is the wordplay.
'half a' suggests halving the letters.
'note' becomes 'e' (musical note).
'dollar' halved is 'dol'.
'dol'+'e'='DOLE'
'is' is the link.
Can you help me to learn more?
(Other definitions for dole that I've seen before include "State assistance" , "Dish (out sparingly)" , "Unemployment benefit (sl.)" , "Unemployment pay" , "Kansas senator and 1996 presidential candidate, Bob" .)