Crossword Genius

Maintain unfinished saw I'd installed for IT company (7,8)

Ross

I believe the answer is:

service provider

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

'maintain unfinished saw i'd installed for it' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'company' is the wordplay.
I cannot quite understand how this works, but
'company' could be 'service' (service is a kind of company) and 'service' is found within the answer.
The remaining letters 'provider' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Times.
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