Drive over border in drag (6)
I believe the answer is:
dredge
'drag' is the definition.
('dredge' can be a synonym of 'drag')
'drive over border' is the wordplay.
'drive' becomes 'dr' (I've seen this in other clues).
'over' says to put letters next to each other.
'border' becomes 'edge' ('edge' can be a synonym of 'border').
'dr'+'edge'='DREDGE'
'in' is the link.
(Other definitions for dredge that I've seen before include "Sprinkle, deepen" , "Scrape up material from sea bed" , "Scoop up mud and silt from harbour bottom" , "dragnet" , "Scour (riverbed); sprinkle with sugar" .)