The most common and most likely answer to this crossword clue is the 6 letter word ERASER
I've seen this crossword clue in Independent
E
R
A
S
E
R
More clues leading to the result ERASER
- Roman things are returned in rubber
- Roman items are sent back in rubber
- Our leading lady as herself — in rubber?
- Rubber tyres a repairman partly rejected
- Rubber wearers cavorting topless
- Part of potboiler, a series with which some writers end?
- Applying this, expect a blank look
- Rubber queen playing herself?
- Stationery item from Times Editor outside
- It can remove errors — no problem
Buddy explains!

The straight part
We know that "the rubber" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case the rubber = eraser.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 ERASER mean?
ERASER noun- One who erases.
- A thing used to erase or remove something written or drawn by a pen or a pencil.
- A thing used to erase something written by chalk on a chalkboard, by marker on a whiteboard, or by some other erasable implement; a chalkboard eraser, whiteboard eraser, etc.
- An overwriter program used to prevent data recovery.