It's nice to be in such a successful firm (4,7)

I believe the answer is:

good company

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

'in such a successful firm' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'it's nice to' is the wordplay.
'it's nice' becomes 'good' (similar in meaning).
'to' becomes 'company' (I can't explain this - if you can you should give a lot more credence to this answer).
'good'+'company'='GOOD COMPANY'

'be' acts as a link.

Can you help me to learn more?

I've seen this clue in The Globe and Mail.

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