Came to A&E impaled on cooking utensil (5)
I believe the answer is:
awoke
'came to' is the definition.
(to come to is to awake from sleep or a faint)
'ae impaled on cooking utensil' is the wordplay.
'impaled on' indicates putting letters inside (inserted letters split open or impale the word).
'cooking utensil' becomes 'wok' (wok is a kind of cooking utensil).
'ae' going around 'wok' is 'AWOKE'.
(Other definitions for awoke that I've seen before include "Stirred" , "Ceased sleeping" , "Came to life" , "raised" , "Came round" .)