The most common and most likely answer to this crossword clue is the 7 letter word ALADDIN
I've seen this crossword clue in The Guardian
A
L
A
D
D
I
N
More clues leading to the result ALADDIN
- A boy appearing with daughter in pantomime
- Pantomime as done for daughters at home
- Pantomime boy involved in a racket
- Supplier of spirit generated by rubber?
- Turing secures D-Day and independence with rubber, perhaps
- Male baddie, one getting stripped for some fun with The Widow Twankey?
- I realised the great potential of rubber
- Show son must be trapped in a racket
- Adult with young man dressed at last in rubber?
- V. Lake’s frequent co-star wearing light rubber?
Buddy explains!

The straight part
We know that "rubber, perhaps" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case rubber, perhaps = aladdin.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.