Love huge Greek character (5)
I believe the answer is:
omega
'greek character' is the definition.
(letter from the Greek alphabet)
'love huge' is the wordplay.
'love' becomes 'o' (In tennis, 'love' means 'zero').
'huge' becomes 'mega' (I've seen this before).
'o'+'mega'='OMEGA'
(Other definitions for omega that I've seen before include "completes a series" , "Consummation" , "letter from abroad" , "Last thing" , "in Greece, the limit!" .)