The bard is so wide (7)
I believe the answer is:
breadth
'so wide' is the definition.
I can't judge whether this definition defines the answer.
'the bard' is the wordplay.
'the bard' can be anagrammed to 'BREADTH'.
However, I'm unsure how the anagram is indicated.
'is' acts as a link.
Can you help me to learn more?
(Other definitions for breadth that I've seen before include "Measure" , "generosity of mind" , "Distance from side to side" , "Wide measurement" , "Width, thickness" .)