Moving so near grounds (6)
I believe the answer is:
reason
'grounds' is the definition.
(thesaurus)
'moving so near' is the wordplay.
'moving' indicates anagramming the letters.
'so'+'near'='sonear'
'sonear' anagrammed gives 'REASON'.
(Other definitions for reason that I've seen before include "Purpose" , "Cause, justification" , "Logic of senora" , "Cause; mind's power" , "Logic, sense" .)