Crossword Genius

Go through again what the old car engine may need (6)

Ross

I believe the answer is:

rebore

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'what the old car engine may need' is the definition.
I can't tell whether this defines the answer.

'go through again' is the wordplay.
'go' becomes 'ebor' (I can't explain this - if you can you should give a lot more credence to this answer).
'through' indicates putting letters inside (inserted letters go through the word).
'again' becomes 're' (prefix meaning 'again').
'ebor' placed within 're' is 'REBORE'.

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