Preview is terrible for estate (9)
I believe the answer is:
foretaste
'preview' is the definition.
(I've seen this before)
'terrible for estate' is the wordplay.
'terrible' indicates an anagram.
'for'+'estate'='forestate'
'forestate' anagrammed gives 'FORETASTE'.
'is' acts as a link.
(Other definitions for foretaste that I've seen before include "Advance sample" , "a sample of goodies to come?" , "Anticipatory experience" , "Sampler" , "A sample of what could be" .)