Adaptation of the Bard shows broadness (7)
I believe the answer is:
breadth
'broadness' is the definition.
(thesaurus)
'adaptation of the bard' is the wordplay.
'adaptation of' is an anagram indicator.
'the'+'bard'='thebard'
'thebard' with letters rearranged gives 'BREADTH'.
'shows' is the link.
(Other definitions for breadth that I've seen before include "Liberal view" , "Measure" , "Wide measurement" , "generosity of mind" , "Red bath (anag)" .)