Some distance into Palmyra, Fallujah the other way (4)
I believe the answer is:
afar
'some distance' is the definition.
(I have seen 'great distance' mean 'afar' so perhaps 'distance' could also mean 'afar')
'into palmyra fallujah the other way' is the wordplay.
'into' indicates the answer is hidden within the clue.
'the other way' is a reversal indicator.
'rafa' is hidden within 'palmyra fallujah'.
'rafa' backwards is 'AFAR'.
(Other definitions for afar that I've seen before include "Distant, not near" , "A long distance away" , "long way back" , "a good way off" , "beyond the horizon" .)