Scared of force initially used in a military attack (6)
I believe the answer is:
afraid
'scared' is the definition.
(similar in meaning)
'force initially used in a military attack' is the wordplay.
'initially used' says to take the initial letters.
'in' means one lot of letters goes inside another.
'military attack' becomes 'raid' (I've seen this in another clue).
The initial letter of 'force' is 'f'.
'a'+'raid'='araid'
'f' inserted within 'araid' is 'AFRAID'.
'of' acts as a link.
(Other definitions for afraid that I've seen before include "Alarmed, fearful" , "wind up" , "Fearful and timid" , "Frightened" , "feeling scared" .)