Act it out in loft (5)
I believe the answer is:
attic
'loft' is the definition.
(synonyms)
'act it out' is the wordplay.
'out' indicates an anagram (out can mean wrong or inaccurate).
'act'+'it'='actit'
'actit' anagrammed gives 'ATTIC'.
'in' is the link.
(Other definitions for attic that I've seen before include "cockloft" , "Athenian Greek" , "Loft room" , "Greek - garret" , "Top chamber" .)