Land: uphill track into promontory (7)
I believe the answer is:
capture
'land' is the definition.
(both can mean to obtain)
'uphill track into promontory' is the wordplay.
'uphill' says the letters should be written in reverse (in a down clue, letters go up).
'track' becomes 'rut' (rut is a kind of track).
'into' indicates putting letters inside.
'promontory' becomes 'cape' (both can mean a headland).
'rut' in reverse letter order is 'tur'.
'tur' inserted into 'cape' is 'CAPTURE'.
(Other definitions for capture that I've seen before include "Take on board" , "Apprehend" , "Collar" , "Seize, catch" , "Take (eg, chess piece)" .)