Good drive up, taking me to northern border (6)

I believe the answer is:

margin

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'border' is the definition.
(I know that border can be written as margin)

'good drive up taking me to northern' is the wordplay.
'good' becomes 'g' (abbreviation).
'drive' becomes 'ram' (RAM drive on a computer).
'up' says the letters should be written in reverse (in down clue: letters go upwards).
'taking me' becomes 'i' (I am not sure about the 'taking' bit.).
'to northern' becomes 'n' (abbreviation e.g. N. Ireland).
'g'+'ram'='gram'
'gram' backwards is 'marg'.
'marg'+'i'+'n'='MARGIN'

Can you help me to learn more?

(Other definitions for margin that I've seen before include "Blank space around a page" , "Bland space around text" , "Edge or space for error" , "Boundary line or the area" , "Border or leeway" .)

I've seen this clue in The Guardian.

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