Crossword Genius

I'm very surprised indeed about northbound track (2,4)

Ross

I believe the answer is:

ye gods

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'i'm very surprised' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'indeed about northbound track' is the wordplay.
'indeed' becomes 'yes' (agreeing).
'about' is an insertion indicator.
'northbound' says the letters should be written in reverse.
'track' becomes 'dog' ('dog' can be a synonym of 'track'**).
'dog' written backwards gives 'god'.
'yes' enclosing 'god' is 'YE GODS'.

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I've seen this clue in The Independent.
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