Crossword Genius

Letters to revise with approval (6)

Ross

I believe the answer is:

credit

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'approval' is the definition.
(I know that credit is a type of approval)

'letters to revise' is the wordplay.
'letters' becomes 'cr' (I can't explain this - if you can you should give a lot more credence to this answer).
'to revise' becomes 'edit' (I've seen this before).
'cr'+'edit'='CREDIT'

'with' is the link.

Can you help me to learn more?

(Other definitions for credit that I've seen before include "Approval" , "support for one with money problems" , "Belief; tick" , "Acknowledgement in a book" , "Believe; good reputation" .)

I've seen this clue in the Evening Standard.
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