Bill is brought to heel by what things cost (5,4)
I believe the answer is:
price list
'what things cost' is the definition.
(I've seen this before)
'bill is brought to heel' is the wordplay.
'bill' becomes 'price' (I can't justify this - if you can you should believe this answer much more).
'is brought to' means one lot of letters go next to another.
'heel' becomes 'list' (both can mean to tilt).
'price'+'list'='PRICE-LIST'
'by' acts as a link.
Can you help me to learn more?
(Other definitions for price list that I've seen before include "what things cost" , "Tariff" .)