No Yankee reactionary has Socialist backing over there (6)
I believe the answer is:
yonder
'over there' is the definition.
(archaic preposition meaning 'over there')
'no yankee reactionary has socialist backing' is the wordplay.
'yankee' becomes 'Y' (phonetic alphabet: alpha, bravo, charlie etc.).
'reactionary' says the letters should be written in reverse (reactions happen in the opposite direction).
'has' says to put letters next to each other.
'socialist' becomes 'red' (socialism is often associated with the colour red).
'backing' says the letters should be written backwards.
'no'+'y'='noy'
'noy' written backwards gives 'yon'.
'red' back-to-front is 'der'.
'yon'+'der'='YONDER'
(Other definitions for yonder that I've seen before include "Rodney (anag.)" , "Distant but within sight" , "to place indicated" , "Over there (poetic)" , "In that direction" .)