Crossword Genius

There in Scotland, nothing very fixed, as British capital intervenes (6)

Ross

I believe the answer is:

overby

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'there in scotland' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'nothing very fixed as british capital intervenes' is the wordplay.
'nothing' becomes 'o' (looks like zero - 0).
'fixed as british capital' becomes 'b' (I can't justify this - if you can you should give a lot more credence to this answer).
'intervenes' means one lot of letters goes inside another.
'very' going around 'b' is 'verby'.
'o'+'verby'='OVERBY'

Can you help me to learn more?

(Another definition for overby that I've seen is " little bit off".)

I've seen this clue in The Hindu.
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