Nothing at court helping Romeo out — here's philtre (4,6)
I believe the answer is:
love potion
'philtre' is the definition.
(I know that philtre can be written as love potion)
'nothing at court helping romeo out' is the wordplay.
I cannot really understand how this works, but
'nothing' could be 'love' (love is zero in tennis) and 'love' is found within the answer.
'at' could be 'on' (location) and 'on' is found within the answer.
This explanation may well be incorrect...
'here's' is the link.
Can you help me to learn more?
(Other definitions for love potion that I've seen before include "Magic drink stimulating desire" , "Aphrodisiac needed!" , "preparation for it" .)