Build Crete poorly (5)
I believe the answer is:
erect
'build' is the definition.
(erecting is a kind of building)
'crete poorly' is the wordplay.
'poorly' is an anagram indicator.
'crete' is an anagram of 'ERECT'.
(Other definitions for erect that I've seen before include "Standing straight" , "Construct - perpendicular" , "Standing vertically" , "Build - straight up" , "Upright or vertical" .)