Eyeglasses, informally (5)
I believe the answer is:
specs
'eyeglasses informally' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for specs that I've seen before include "what builders are doing?" , "Glasses (abbr)" , "Glasses (abbrev.)" , "Do they help one to see" , "shades?" .)