Appliance at store exploded (7)
I believe the answer is:
toaster
'appliance' is the definition.
(toaster is a kind of appliance)
'at store exploded' is the wordplay.
'exploded' is an anagram indicator.
'at'+'store'='atstore'
'atstore' anagrammed gives 'TOASTER'.
(Other definitions for toaster that I've seen before include "one that suggests health" , "Kitchenware" , "Kitchen browner" , "At store (anag.)" , "wedding present?" .)