Cryptic crossword clue
Rubber and pencil-sharpener Poe normally used for quoting back 8

The most common and most likely answer to this crossword clue is the 8 letter word NEOPRENE

I've seen this crossword clue in Financial Times
N
E
O
P
R
E
N
E

Buddy explains!

The straight part
We know that "Rubber" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case rubber = neoprene.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does NEOPRENE mean?

NEOPRENE noun
  1. A synthetic rubber, a polymer of chloroprene, commonly used in wetsuits, laptop sleeves, orthopedic braces, electrical insulation, liquid and sheet-applied elastomeric membranes and flashings, car fan belts, etc.

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