Love can mean this on flipping stormy night (7)
I believe the answer is:
nothing
'love' is the definition.
(love means zero in tennis)
'on flipping stormy night' is the wordplay.
'flipping' says the letters should be written in reverse.
'stormy' is an anagram indicator.
'on' reversed gives 'no'.
'night' with letters rearranged gives 'thing'.
'no'+'thing'='NOTHING'
'can mean this' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for nothing that I've seen before include "Zilch, nada" , "Unimportant item" , "Zero, naught" , "Something sweet" , "Not a whit" .)