Argus-eyed (5 letters)

Become cognizant (5 letters)

Tip off (4 letters)

"Woof!," e.g. (4 letters)

Signal the doctor (4 letters)

Kind of alert (4 letters)

Morning sound (5 letters)

Buster? (4 letters)

"The sweetest gift of heaven": Virgil (5 letters)

Enthusiastic audience response (4 letters)