One million confirmed in property valuation (8)
I believe the answer is:
estimate
'property valuation' is the definition.
'estimate' can be an answer for 'valuation' (I've seen this before). I'm unsure of the 'property' bit.
'one million confirmed in' is the wordplay.
'one million' becomes 'im' (resembles em).
'confirmed' becomes 'estate' (I can't justify this - if you can you should believe this answer much more).
'in' is an insertion indicator.
'im' placed inside 'estate' is 'ESTIMATE'.
Can you help me to learn more?
(Other definitions for estimate that I've seen before include "Make an approximate assessment" , "Calculate in approximate way" , "Reckon value" , "Guess, rough calculation" , "Quotation" .)