Crossword Genius

Add-on for individual office telephone (9)

Ross

I believe the answer is:

extension

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This could be a double definition.

'add-on' is the first definition.
(I know that addon can be written as extension)

'individual office telephone' is the second definition.
'extension' can be an answer for 'telephone' (extension is a kind of telephone). I am unsure of the 'individual office' bit.

'for' is the link.

Can you help me to learn more?

(Other definitions for extension that I've seen before include "Added part" , "telephone number" , "new part of home?" , "more rooms in house maybe" , "Additional rooms" .)

I've seen this clue in The Telegraph.
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