Boost big business and erase corruption (8)
I believe the answer is:
'boost' is the definition.
(I know that boost is a more specific form of the action increase)
'big business and erase corruption' is the wordplay.
'big business' becomes 'inc' (I can't justify this - if you can you should give a lot more credence to this answer).
'and' means one lot of letters go next to another.
'corruption' indicates an anagram.
'erase' with letters rearranged gives 'rease'.
Can you help me to learn more?
(Other definitions for increase that I've seen before include "Add, make bigger" , "Increment" , "Wax" , "Multiply" , "Amplification" .)