Good girls making spectacles (7)
I believe the answer is:
glasses
'spectacles' is the definition.
('glasses' can be a synonym of 'spectacles')
'good girls' is the wordplay.
'good' becomes 'g' (abbreviation).
'girls' becomes 'lasses' (lass is a kind of girl).
'g'+'lasses'='GLASSES'
'making' acts as a link.
(Other definitions for glasses that I've seen before include "Spectacles and receptacles" , "Drinks" , "Help in making out" , "Barnacles" , "They make girls unattractive to Parker" .)