Fury after backing pose with Apple gadget (9)

'fury' is the definition.
(I know that Tisiphone is a type of fury)

'backing pose with apple gadget' is the wordplay.
'backing' says the letters should be written backwards.
'pose' becomes 'sit' (synonyms).
'with' is a charade indicator (letters next to each other).
'apple gadget' becomes 'iphone' (I can't justify this - if you can you should give a lot more credence to this answer).
'sit' back-to-front is 'tis'.
'tis'+'iphone'='TISIPHONE'

'after' is the link.

Can you help me to learn more?