Crossword Genius

In America, where an attractive force may be said to act for the capital of Virginia? (6,2,7)

Ross

I believe the answer is:

center of gravity

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

'in america where an attractive force may be said to act' is the definition.
(US spelling of 'centre of gravity')

'for the capital of virginia?' is the wordplay.
I cannot quite understand how this works, but
an anagram of 'for' is 'rof' which is present in the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is present in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Guardian.
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