Look at last king & queen (6)
I believe the answer is:
gander
This clue could be a double definition.
'look at' is the first definition.
(I've seen this before)
'last king queen' is the second definition.
The definition and answer can be both animals as well as being singular nouns.
Maybe you can see a link between them that I don't see?
Can you help me to learn more?
(Other definitions for gander that I've seen before include "Looking at something - ranged (anag)" , "'What's sauce for the goose is sauce for the . . . . . .'" , "Male 7 across" , "waterbird" , "glance" .)