Boost big business and erase corruption (8)
I believe the answer is:
increase
'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'.
'inc'+'rease'='INCREASE'
Can you help me to learn more?
(Other definitions for increase that I've seen before include "Add, make bigger" , "Increment" , "Wax" , "Multiply" , "Amplification" .)