Crossword Genius

Boost big business and erase corruption (8)

Ross

I believe the answer is:

increase

I'm a little stuck... Click here to teach me more about this clue!

'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" .)

I've seen this clue in the Sydney Morning Herald.
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