Tech giant rolling back AI after new fine (5)

I believe the answer is:

nokia

I'm a little stuck... Click here to teach me more about this clue!

'tech giant rolling' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'back ai after new fine' is the wordplay.
'back' is a reversal indicator.
'after' says to put letters next to each other.
'new' becomes 'n' (abbreviation as in New Testament NT).
'fine' becomes 'ok' (synonyms).
'ai' back-to-front is 'ia'.
'n'+'ok'='nok'
'ia' after 'nok' is 'NOKIA'.

Can you help me to learn more?

Want a hint initially instead of a full solution? Install my app