Gushing (8)
'gushing' is the definition.
(I know that gushing can be written as effusive)
This is the entire clue.
(Other definitions for effusive that I've seen before include "Expressing emotions in unrestrained way, gushy" , "Gushingly emotive" , "Unrestrained (gratitude)" , "Pouring out words" , "(Of person) gushing" .)
'gushing' is the definition.
('spurt' can be a synonym of 'gush')
This is all the clue.
(Another definition for spurting that I've seen is " Gushing forth in a sudden stream".)