She positions America between the Poles (5)
I believe the answer is:
susan
'she' is the definition.
'america between the poles' is the wordplay.
'america' becomes 'usa' (synonyms).
'between' indicates putting letters inside.
'the poles' becomes 'SN' (North and South poles).
'usa' placed inside 'sn' is 'SUSAN'.
'positions' is the link.
This may not be right. It may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for susan that I've seen before include "Girl (sometimes lazy?)" , "woman" , "Girl's name; lazy -" , "-- Howatch, novelist" , "female" .)