ICBM in 60 seconds going behind island (9)
I believe the answer is:
minuteman
'icbm' is the definition.
(type of intercontinental ballistic missile)
'in 60 seconds going behind island' is the wordplay.
'in e0 seconds going' becomes 'minute' (I can't explain this - if you can you should believe this answer much more).
'behind' means one lot of letters go next to another.
'island' becomes 'man' (the Isle of Man is an example).
'minute'+'man'='MINUTEMAN'
Can you help me to learn more?
(Other definitions for minuteman that I've seen before include "could be called up at short notice" , "American revolutionary militia member" , "early American fighter" , "Someone always ready for action" , "one formed up in Lexington" .)