Worker poised to move down under (9)
I believe the answer is:
antipodes
'down under' is the definition.
(I've seen this before)
'worker poised to move' is the wordplay.
'worker' becomes 'ant' (worker is a type of ant).
'to move' indicates anagramming the letters.
'poised' anagrammed gives 'ipodes'.
'ant'+'ipodes'='ANTIPODES'
(Other definitions for antipodes that I've seen before include "Regions on diametrically opposite sides of the Earth" , "Distant places" , "The other side of the world" , "Diametrically opposite location" , "places poles apart?" .)