Business bill cutting cost (8)
I believe the answer is:
practice
'business bill cutting cost' is the definition.
I can't judge whether this definition defines the answer.
'business bill cutting cost' is the wordplay.
'business bill' becomes 'act' (I've seen this in other clues. I am not sure about the 'business' bit.).
'cutting' is an insertion indicator (some letters cut their way into a word).
'cost' becomes 'price' (price is a kind of cost).
'act' going into 'price' is 'PRACTICE'.
Can you help me to learn more?
(Other definitions for practice that I've seen before include "Learn by repetition" , "Professional business of doctor or lawyer" , "It makes perfect, 'tis said" , "It's said to make perfect" , "Exercise; professional business" .)