Architect detailed foundations of dedicated office block (6)
I believe the answer is:
impede
'block' is the definition.
(synonyms)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for impede that I've seen before include "Delay; block progress of" , "Hinder or obstruct, say progress" , "Delay progress of (something)" , "Put obstacle in the way, hinder" , "Delay, be an obstacle" .)