Motor track encircles old station, in the main (8)

I believe the answer is:

caroline

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'station in the main' is the definition.
The definition suggests an adjective which matches the answer.

'motor track encircles old' is the wordplay.
'motor' becomes 'car' (informal term for car).
'track' becomes 'line' (line is a kind of track).
'encircles' is an insertion indicator.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'car'+'line'='carline'
'carline' going around 'o' is 'CAROLINE'.

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(Other definitions for caroline that I've seen before include "Lady - Lamb, Lord Byron's lover" , "No eclair for this girl" , "Girl's name - relating to Stuart king" .)

I've seen this clue in The Independent.

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