Going north, old acquired land (4)
I believe the answer is:
togo
'land' is the definition.
(Togo is an example)
'going north old acquired' is the wordplay.
'going north' is a reversal indicator.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'acquired' becomes 'got' ('get' can be a synonym of 'acquire').
'o'+'got'='ogot'
'ogot' back-to-front is 'TOGO'.
(Other definitions for togo that I've seen before include "W African country" , "Remaining united" , "West Africa country, capital Lome" , "West African republic" , "place in Africa" .)