Pleasure is fantastic, excited about love (12)
I believe the answer is:
satisfaction
'pleasure' is the definition.
(I've seen this before)
'is fantastic excited about love' is the wordplay.
'excited' is an anagram indicator.
'about' indicates putting letters inside.
'love' becomes 'o' (love means zero in tennis).
'is'+'fantastic'='isfantastic'
'isfantastic' with letters rearranged gives 'satisfactin'.
'satisfactin' going around 'o' is 'SATISFACTION'.
(Other definitions for satisfaction that I've seen before include "I can't get no - (Rolling Stones)" , "Contentment; reparation" , "Pleasure" , "Fulfilment; compensation" , "Gratification" .)