English spymaster heading fishy mission? (7)
I believe the answer is:
embassy
'mission?' is the definition.
(I've seen this in another clue)
'english spymaster heading fishy' is the wordplay.
'english' becomes 'E' (abbreviation).
'spymaster' becomes 'M' (M is the head of MI6 in James Bond).
'heading' is a charade indicator (letters next to each other) (some letters go in front of or head others).
'fishy' becomes 'bassy' (I can't explain this - if you can you should give a lot more credence to this answer).
'e'+'m'+'bassy'='EMBASSY'
Can you help me to learn more?
(Other definitions for embassy that I've seen before include "Where an ambassador lives or works" , "Ambassador's office" , "Residence of foreign diplomatic representative" , "Diplomatic mission" , "Diplomatic building for ambassadors" .)