Material popped up: three books with real worth initially condemned (6,4)
I believe the answer is:
bubble wrap
'material' is the definition.
(bubble wrap is a kind of material)
'popped up three books with real worth initially condemned' is the wordplay.
I cannot quite see how this works, but
'books' could be 'bb' (two abbreviations for book) and 'bb' is present in the answer.
'with' could be 'w' (abbreviation) and 'w' is present in the answer.
an anagram of 'real' is 'lera' which is located in the remaining letters.
'up' is found in the answer.
A single letter 'b' remains which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for bubble wrap that I've seen before include "Plastic packaging material fun to pop!" , "Packing material (which can be popped!)" .)