Love: a term of endearment (4)
I believe the answer is:
duck
'love' is the definition.
(love and duck mean zero in tennis and cricket)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for duck that I've seen before include "Cringe maybe" , "Evade, nought (cricket)" , "Steer clear" , "Avoid (tricky question)" , "Eg, eider; get down" .)