Build in corner patio untidily (11)
I believe the answer is:
incorporate
'build' is the definition.
(thesaurus)
'corner patio untidily' is the wordplay.
'untidily' indicates anagramming the letters (I've seen this in other clues).
'corner'+'patio'='cornerpatio'
'cornerpatio' anagrammed gives 'INCORPORATE'.
'in' is the link.
(Other definitions for incorporate that I've seen before include "Form a merger" , "Include as constituent part" , "Create whole body" , "Embody" .)