Quick peek (6)
'quick peek' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for glance that I've seen before include "A quick sideways look" , "Batsman's stroke" , "black shiny stuff" , "Oblique impact" , "Glimpse" .)
(Other definitions for gander that I've seen before include "Male 7 across" , "Goose sauce is good for it" , "'What's sauce for the goose is sauce for the . . . . . .'" , "Ranged about with male goose" , "A butcher's -- bird" .)