All you need to know about love: it's devastating and is huge (6,4)
I believe the answer is:
enough said
'all you need to know' is the definition.
(both can indicate enough has been shared)
'about love it's devastating and is huge' is the wordplay.
'about' is an insertion indicator.
'love' becomes 'o' (love means zero in tennis).
'it's devastating' indicates an anagram.
'and'+'is'+'huge'='andishuge'
'andishuge' anagrammed gives 'enughsaid'.
'o' inserted inside 'enughsaid' is 'ENOUGH SAID'.
(Other definitions for enough said that I've seen before include "there's nothing to add" , "No need for comment" .)