Loads of praise, inaccurate, bringing illusory happiness (5,8)
I believe the answer is:
fools paradise
'illusory happiness' is the definition.
(I've seen this before)
'loads of praise inaccurate' is the wordplay.
'inaccurate' is an anagram indicator.
'loads'+'of'+'praise'='loadsofpraise'
'loadsofpraise' with letters rearranged gives 'FOOLS PARADISE'.
'bringing' acts as a link.
(Other definitions for fools paradise that I've seen before include "Illusory state of wellbeing" , "State of ignorant happiness" , "Illusory happiness" , "Blissfully ignorant state" , "Deceptively happy state" .)