Builds and the secret is out (6)
I believe the answer is:
erects
'builds' is the definition.
(erecting is a kind of building)
'the secret is out' is the wordplay.
'is out' is an anagram indicator (out can mean wrong or inaccurate).
'secret' anagrammed gives 'ERECTS'.
'and' is the link.
(Other definitions for erects that I've seen before include "Raises" , "Put up, builds" , "Sets up or builds." , "Puts up, stand or building" , "Puts up, say building" .)