Professional revealed spiritual knowledge in forecast (9)
I believe the answer is:
prognosis
'knowledge in forecast' is the definition.
'prognosis' can be an answer for 'forecast' (synonyms). I am not certain of the 'knowledge in' bit.
'professional revealed spiritual' is the wordplay.
'professional' becomes 'pro' (synonyms).
'revealed spiritual' becomes 'gnosis' (I am not sure about this - if you are sure you should believe this answer much more).
'pro'+'gnosis'='PROGNOSIS'
Can you help me to learn more?
(Other definitions for prognosis that I've seen before include "Forecast, outlook" , "Prediction as to how something will turn out" , "Medical opinion" , "Medical prediction" , "Forecast of course of illness as by doctor" .)