Possible Clues:

• Kind of love that's very open, like 8 and 15 exemplifying 3 7
• Gobsmacked when assistant returns in time
• Like a mouth hanging open in shock
• In awe of silver crowned primate
• Open with incredulity
• Catching flies, so to speak
• With one's jaw on the floor, so to speak
• Shocked seeing space in hospital department
• Turning over in sleep, a gastronome's yawning
• Displaying astonishment