Love huge end of a series (5)
I believe the answer is:
omega
'end of a series' is the definition.
(I've seen this in another clue)
'love huge' is the wordplay.
'love' becomes 'o' (love means zero in tennis).
'huge' becomes 'mega' (mega can mean very large).
'o'+'mega'='OMEGA'
(Other definitions for omega that I've seen before include "Art of story-telling by body movement" , "Foreign character" , "letter to Greeks" , "character from Athens" , "Conclusion" .)