Method of waking up in the style of Royal Marines (5)
I believe the answer is:
alarm
'method of waking up' is the definition.
I can't tell whether this definition defines the answer.
'in the style of royal marines' is the wordplay.
'in the style of' becomes 'a la' (e.g. chicken a la King).
'royal marines' becomes 'RM' (abbreviation).
'ala'+'rm'='ALARM'
Can you help me to learn more?
(Other definitions for alarm that I've seen before include "Announcement of danger" , "A rousing sound in the morning" , "Unnerve" , "Feeling of fear" , "Panicky arousal" .)