Gold, say, in electrical component (7)
I believe the answer is:
element
This clue is a double definition.
'gold say' is the first definition.
(gold is a kind of element)
'electrical component' is the second definition.
(part of an oven or other device which heats up)
'in' acts as a link.
(Other definitions for element that I've seen before include "He, say" , "A first principle, found in a kettle?" , "Ideal situation for someone" , "Constituent component" , "part of a toaster" .)