Knowing cute trail out of building (13)
I believe the answer is:
architectural
'building' is the definition.
(thesaurus)
'knowing cute trail out' is the wordplay.
'knowing' becomes 'arch' (I've seen this before).
'out' indicates an anagram (out can mean wrong or inaccurate).
'cute'+'trail'='cutetrail'
'cutetrail' anagrammed gives 'itectural'.
'arch'+'itectural'='ARCHITECTURAL'
'of' acts as a link.
(Other definitions for architectural that I've seen before include "Pertaining to the design of buildings" , "Planning some construction" , "linked to building" , "Relating to building design" .)