Have a quick look and stay back (4)
I believe the answer is:
peek
'have a quick look' is the definition.
'stay back' is the wordplay.
'stay' becomes 'keep' (keeping is a kind of staying).
'back' shows that the letters should be reversed in order.
'keep' reversed gives 'PEEK'.
'and' is the link.
(Other definitions for peek that I've seen before include "Quick, sly look" , "Sly look, peep" , "spy" , "Furtive glance" , "Glimpse" .)