Work spade into lands down south (9)
I believe the answer is:
antipodes
'lands down south' is the definition.
'work spade into' is the wordplay.
'work' indicates anagramming the letters.
'spade'+'into'='spadeinto'
'spadeinto' with letters rearranged gives 'ANTIPODES'.
(Other definitions for antipodes that I've seen before include "Do panties (anag.)" , "The other side of the world" , "places poles apart?" , "exactly opposite" , "Australasia?" .)