Gossamer thin? Excellent (4,4)
I believe the answer is:
very fine
'excellent' is the definition.
I know nothing about this answer so I cannot tell whether this works.
'gossamer thin?' is the wordplay.
'gossamer' becomes 'very' (I am not sure about this - if you are sure you should believe this answer much more).
'thin?' becomes 'fine' ('fine' can be similar in meaning to 'thin').
'very'+'fine'='VERY FINE'
Can you help me to learn more?
Want a hint initially instead of a full solution?
Install my app