Stare at them and yawn (4)
I believe the answer is:
gape
This might be a double definition.
'stare at' is the first definition.
(I've seen this in another clue)
'yawn' is the second definition.
(I know that yawn can be written as gape)
'them and' is the link.
I am not very happy about this link. Some or all of it may belong to one of the definitions.
Can you help me to learn more?
(Other definitions for gape that I've seen before include "watch in wonder" , "Look amazed" , "Gawp" , "Stare at page" , "Look open-mouthed" .)