The most common and most likely answer to this crossword clue is the 6 letter word TEFLON
I've seen this crossword clue in The Daily Telegraph
T
E
F
L
O
N
More clues leading to the result TEFLON
- Avoiding blame when our language teaching gets no backing
- Plastic felt over bottom of pan
- Engineer left broadcasting, managing to dodge scandal?
- The financial ombudsman limits this material
- Like a slippery president left’s disposed against?
- Covering bottom of utensil, often slippery — is it?
- Broken left leg? That’s tough, and . . . .
- Material X subsumes fellow, oddly
- Untouchable broken left leg
- Left working and working – it won’t stick
Buddy explains!

The straight part
We know that "Material" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case material = teflon.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 TEFLON mean?
TEFLON noun- Polytetrafluoroethylene, PTFE
- Non-stick, slick.