Get a look (at) (4)
'get a look at' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for espy that I've seen before include "Spot at a distance" , "Catch sight of (poetic)" , "Watch" , "Perceive" , "Make out at a distance" .)
(Other definitions for peer that I've seen before include "Look; earl" , "Noble; look with difficulty" , "Look hard at the nobleman" , "Struggle to see; equal" , "Member of the nobility" .)