Cause to move so near (6)
I believe the answer is:
reason
'cause' is the definition.
(I've seen this before)
'to move so near' is the wordplay.
'to move' indicates anagramming the letters (I've seen 'moved' mean this).
'so'+'near'='sonear'
'sonear' with letters rearranged gives 'REASON'.
(Other definitions for reason that I've seen before include "Explanation or motive" , "Motive; argue" , "Cause; mind's power" , "Cause, explanation" , "Motive for an action" .)