Japanese company in silk gown occasionally (5)

I believe the answer is:

nikon

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

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

'in silk gown occasionally' is the wordplay.
'occasionally' indicates alternate letters (letters taken at regular intervals or occasions).
'in'+'silk'+'gown'='insilkgown'
The alternate letters of 'insilkgown' are 'NIKON'.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.

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