Look again, as wreck uncovered hell! (7)
I believe the answer is:
recheck
'look again' is the definition.
'wreck uncovered hell' is the wordplay.
'uncovered' indicates the central letters.
'hell' becomes 'heck' (interjections!).
The middle of 'wreck' is 'rec'.
'rec'+'heck'='RECHECK'
'as' acts as a link.
(Other definitions for recheck that I've seen before include "continue to attack king?" , "take another careful look" , "Verify again" , "Make doubly sure" .)