One moving near it is sloth (7)
I believe the answer is:
inertia
'is sloth' is the definition.
(inertia can mean laziness or sloth)
'one moving near it' is the wordplay.
'one' becomes 'i' (Roman numeral).
'moving' indicates an anagram (letters are moved around).
'near'+'it'='nearit'
'nearit' is an anagram of 'nertia'.
'i'+'nertia'='INERTIA'
(Other definitions for inertia that I've seen before include "Chemical or other inactivity" , "Resistance to movement" , "Slowness to act, lassitude" , "Idling" , "showing reluctance to move" .)