Invite inside with George Waterhouse's partner revealing what he would charge (6,5)
I believe the answer is:
asking price
'invite inside with george waterhouse's partner revealing what he' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.
'would charge' is the wordplay.
'would' becomes 'asking' (I can't explain this - if you can you should give a lot more credence to this answer).
'charge' becomes 'price' (I've seen this in another clue).
'asking'+'price'='ASKING PRICE'
Can you help me to learn more?
(Other definitions for asking price that I've seen before include "At which something is offered for sale" , "Value for sale" , "Sum at negotiation start" , "how much is wanted initially?" , "Amount for which item is offered" .)