Scamp so out of range (7)
I believe the answer is:
compass
'range' is the definition.
('compass' can be a synonym of 'range')
'scamp so out' is the wordplay.
'out' is an anagram indicator (out can mean wrong or inaccurate).
'scamp'+'so'='scampso'
'scampso' is an anagram of 'COMPASS'.
'of' acts as a link.
(Other definitions for compass that I've seen before include "Achieve" , "Course guide" , "Device with magnetic needle for determining direction" , "Navigational aid" , "Range, scope" .)