Scope the bard out (7)
I believe the answer is:
breadth
'scope' is the definition.
(I've seen this in another clue)
'the bard out' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'the'+'bard'='thebard'
'thebard' is an anagram of 'BREADTH'.
(Other definitions for breadth that I've seen before include "Width, thickness" , "Measurement from side to side" , "Liberal view" , "Extent from side to side" , "Lateral extent" .)