Fabulous design of Lauren (6)
I believe the answer is:
unreal
'fabulous' is the definition.
('unreal' can be similar in meaning to 'fabulous')
'design of lauren' is the wordplay.
'design of' indicates an anagram (I've seen this in other clues).
'lauren' is an anagram of 'UNREAL'.
(Other definitions for unreal that I've seen before include "Not factual" , "Existing only in the imagination, not actual" , "Not actual or credible" , "Fanciful" , "Dreamlike" .)