Kitchen appliance at store explodes (7)
I believe the answer is:
toaster
'kitchen appliance' is the definition.
(toaster is a kind of kitchen appliance)
'at store explodes' is the wordplay.
'explodes' is an anagram indicator.
'at'+'store'='atstore'
'atstore' anagrammed gives 'TOASTER'.
(Other definitions for toaster that I've seen before include "In the morning, this device used" , "Health-promoting" , "Device using sliced bead" , "At store (anag.)" , "one that suggests health" .)