Built fun construction encapsulating love being abundant (9)
I believe the answer is:
bountiful
'abundant' is the definition.
(thesaurus)
'built fun construction encapsulating love' is the wordplay.
'construction' indicates an anagram (answer constructed from certain letters).
'encapsulating' indicates putting letters inside (inserted letters are absorbed or encapsulated).
'love' becomes 'o' (love means zero in tennis).
'built'+'fun'='builtfun'
'builtfun' is an anagram of 'buntiful'.
'buntiful' placed around 'o' is 'BOUNTIFUL'.
'being' acts as a link.
(Other definitions for bountiful that I've seen before include "Generous in giving -- abundant" , "liberal" , "flush with bonus for joining up?" , "Ample or generous (Lady!)" , "Available in large quantities" .)