After start of construction, guarantee criticism (7)
I believe the answer is:
censure
'criticism' is the definition.
(I've seen this before)
'after start of construction guarantee' is the wordplay.
'after start of' means to remove the first letter (I've seen 'after starting' mean this (only the letters found after the first are used)).
'construction' becomes 'wc' (W.C. is an example).
'guarantee' becomes 'ensure' ('ensure' can be a synonym of 'guarantee').
'wc' with its initial letter removed is 'c'.
'c'+'ensure'='CENSURE'
(Other definitions for censure that I've seen before include "Carpet" , "Strong criticism or condemnation" , "Blame or rebuke" , "Harsh criticism or disapproval" , "Official reprimand" .)