Glaring when I take out the blueprint (5)
I believe the answer is:
plain
'glaring' is the definition.
(thesaurus)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for plain that I've seen before include "Ordinary; area of land" , "Unembellished" , "Unvarnished" , "Not complicated" , "Simple - flatland" .)