A total love of wrestling (4)
I believe the answer is:
sumo
'wrestling' is the definition.
(I know that sumo is a type of wrestling)
'a total love' is the wordplay.
'a total' becomes 'sum' ('sum' can be a synonym of 'total').
'love' becomes 'o' (love means zero in tennis).
'sum'+'o'='SUMO'
'of' acts as a link.
(Other definitions for sumo that I've seen before include "Large Japanese wrestler" , "slappers fighting?" , "Japanese wrestling for huge men" , "Japanese wrestling with big fat men" , "Jap. wrestling" .)