Astonished by a direction to fight (3-6)
I believe the answer is:
awe-struck
'astonished' is the definition.
(awe-struck means astonished or amazed)
'a direction to fight' is the wordplay.
'direction' becomes 'west' (compass direction).
'to fight' becomes 'ruck' (I've seen this before).
'a'+'west'+'ruck'='AWE-STRUCK'
'by' acts as a link.
(Other definitions for awe-struck that I've seen before include "Overcome by wonder" , "Suddenly filled with wonder or fear" , "Dumbfounded" , "Stunned" , "Showing a feeling of wonder and dread" .)