Signed off the work of the architect (6)
I believe the answer is:
design
'the work of the architect' is the definition.
I can't tell whether this definition defines the answer.
'signed off' is the wordplay.
'off' is an anagram indicator.
'signed' is an anagram of 'DESIGN'.
Can you help me to learn more?
(Other definitions for design that I've seen before include "Bluepriint, pattern" , "End" , "Provide blueprint" , "Preliminary sketch or plan" , "Signed off on blueprint" .)