Easy thing, to obstruct building material (6,5)
I believe the answer is:
breeze block
'material' is the definition.
Both the definition and answer are singular nouns.
Perhaps they are linked in a way I don't understand?
'easy thing to obstruct' is the wordplay.
I cannot quite understand how this works, but
'easy' could be 'breeze' (I've seen this before) and 'breeze' is found in the answer.
'obstruct' could be 'block' (synonyms) and 'block' is located in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
'building' acts as a link.
Can you help me to learn more?
(Other definitions for breeze block that I've seen before include "Lightweight brick" , "Large light brick" , "Building brick" , "part of a build-up?" .)