The most common and most likely answer to this crossword clue is the 7 letter word ACRYLIC
I've seen this crossword clue in Independent
A
C
R
Y
L
I
C
More clues leading to the result ACRYLIC
- Paint: answer call with small amount of it mostly
- Paint a pack of hounds with vermin cut off
- Fibre replaced Lycra in crop tops
- Medium lycra pants and cape for one to wear
- Special paint — a small amount not quite covering blubber
- Almost lyrical about carbon fibre
- Bill and Cyril worked to produce fibre
- Short girl outside shed tears fabric
- Paint tea party attendee almost eating blubber
- A medium seeing adventurous girl almost restraining sob
Buddy explains!

The straight part
We know that "fibre" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fibre = acrylic.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 ACRYLIC mean?
ACRYLIC noun- An acrylic resin.
- A paint containing an acrylic resin.
- A painting executed using such a paint.
- A thick sheet of plastic.
- A liquid coating system based on an acrylic resin
- Derived from acrylic acid or acrylonitrile.
- Containing an acrylic resin.