Alarmed Air Force with rapid surprise attack (6)
I believe the answer is:
afraid
'alarmed' is the definition.
(similar in meaning)
'air force with rapid surprise attack' is the wordplay.
'air force' becomes 'af' (this could be a standard abbreviation which I don't know about).
'with' means one lot of letters go next to another.
'rapid surprise attack' becomes 'raid' (I've seen this before).
'af'+'raid'='AFRAID'
Can you help me to learn more?
(Other definitions for afraid that I've seen before include "feeling scared" , "Nervous" , "Feeling anxiety or fear" , "Filled with fear" , "Fearful and timid" .)