Talk amorously (3)
I believe the answer is:
coo
'talk amorously' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for coo that I've seen before include "well I never!" , "Pigeon noise" , "Speak lovingly -- cry softly" , "Call like a dove" , "Make loving sounds -bill and . . ." .)