Duck, darling! (4)
I believe the answer is:
love
I believe this is a double definition.
'duck' is the first definition.
(duck and love mean zero in cricket and tennis)
'darling' is the second definition.
(both are terms of endearment)
(Other definitions for love that I've seen before include "Nothing for the Williams sisters?" , "Disappointing score" , "angel" , "Romantic feeling" , "Strong affection" .)