Bishop providing topless pubs and glasses (8)
I believe the answer is:
bifocals
'glasses' is the definition.
(I've seen this before)
'bishop providing topless pubs' is the wordplay.
'bishop' becomes 'b' (abbreviation used in chess).
'providing' becomes 'if' (I've seen this in other clues).
'topless' means to remove the first letter.
'pubs' becomes 'locals'.
'locals' with its initial letter taken off is 'ocals'.
'b'+'if'+'ocals'='BIFOCALS'
'and' acts as a link.
(Other definitions for bifocals that I've seen before include "Spectacles for both near and far vision" , "Two-lenses-in-one specs" , "Type of specs" , "Eye-glasses with two ranges" , "Type of glasses" .)