Article amongst electrics is going into decline (9)
I believe the answer is:
withering
'going into decline' is the definition.
'article amongst electrics' is the wordplay.
'article' becomes 'the' (the 'definite article' part of speech).
'amongst' indicates putting letters inside (I've seen this in other clues).
'electrics' becomes 'wiring' (I've seen this before).
'the' inserted inside 'wiring' is 'WITHERING'.
'is' acts as a link.
(Other definitions for withering that I've seen before include "Supercilious" , "Devastating" .)