Predict warning will be given to holy office (7)
I believe the answer is:
foresee
'predict' is the definition.
(I've seen this in another clue)
'warning will be given to holy office' is the wordplay.
'warning will be' becomes 'fore' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'given to' means one lot of letters go next to another.
'holy office' becomes 'see' (I've seen this in another clue).
'fore'+'see'='FORESEE'
Can you help me to learn more?
(Other definitions for foresee that I've seen before include "Predict" , "Be aware of beforehand" , "divine" , "Imagine" , "Envisage" .)