Iron tree uprooted and set in a different position (8)
I believe the answer is:
reorient
'set in a different position' is the definition.
'iron tree uprooted' is the wordplay.
'uprooted' is an anagram indicator.
'iron'+'tree'='irontree'
'irontree' anagrammed gives 'REORIENT'.
'and' is the link.
(Other definitions for reorient that I've seen before include "Rising again" , "Re-align" , "Change the direction of (something)" , "Change one's attitude" .)