Doing as is set out will offer identification of condition (9)
I believe the answer is:
diagnosis
'identification of condition' is the definition.
'diagnosis' can be an answer for 'identification' (diagnosis is a kind of identification). I am unsure of the 'of condition' bit.
'doing as is set out will offer' is the wordplay.
'is set out' indicates anagramming the letters.
'will offer' becomes 'is' (I can't explain this - if you can you should give a lot more credence to this answer).
'doing'+'as'='doingas'
'doingas' anagrammed gives 'diagnos'.
'diagnos'+'is'='DIAGNOSIS'
Can you help me to learn more?
(Other definitions for diagnosis that I've seen before include "Interpretation of" , "Identification of an illness" , "Identification of disease" , "doctor's opinion" , "medical opinion" .)