Large sense about pieces of glass (6)
I believe the answer is:
lenses
'pieces of glass' is the definition.
'lenses' can be an answer for 'pieces' (lens is a kind of piece). I'm not certain of the 'of glass' bit.
'large sense about' is the wordplay.
'large' becomes 'l' (eg in clothes sizes).
'about' indicates anagramming the letters.
'sense' with letters rearranged gives 'enses'.
'l'+'enses'='LENSES'
Can you help me to learn more?
(Other definitions for lenses that I've seen before include "Eye parts" , "Camera attachments" , "The glasses in spectacles" , "They could help you see" , "They're transparent in the eye" .)