Predict change under Foreign Office (8)
I believe the answer is:
forecast
'predict' is the definition.
(I know that forecast is a more specific form of predict)
'change under foreign office' is the wordplay.
'change' becomes 'recast' (I can't explain this - if you can you should give a lot more credence to this answer).
'under' is a charade indicator (letters next to each other) (in a down clue, some letters go below others).
'foreign office' becomes 'FO' (abbreviation).
'recast' after 'fo' is 'FORECAST'.
Can you help me to learn more?
(Other definitions for forecast that I've seen before include "Fear Scot in prediction" , "Divine" , "Predict as with weather" , "Predict (event)" , "Prophecy" .)