Waylaid (8)
I believe the answer is:
ambushed
'waylaid' is the definition.
('ambush' can be a synonym of 'waylay')
This is all the clue.
(Other definitions for ambushed that I've seen before include "taken, surprisingly" , "Taken by surprise in war" , "surprised?)" , "Lay in wait and waylaid" , "Attacked (someone) from concealment" .)