Plastic felt over bottom of pan (6)
I believe the answer is:
teflon
'plastic' is the definition.
(Teflon is an example)
'felt over bottom of pan' is the wordplay.
'over' is an anagram indicator.
'bottom of pan' becomes 'on' (I can't justify this - if you can you should believe this answer much more).
'felt' anagrammed gives 'tefl'.
'tefl'+'on'='TEFLON'
Can you help me to learn more?
(Other definitions for teflon that I've seen before include "Non-stick coating as for frying pans" , "Synthetic resin to prevent sticking" , "Non-stick coating (trademark)" , "Non-stick coating - evading blame" , "It's coated on surface to prevent sticking" .)