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Answer for the clue "Celebrity ignores upper class creep ", 9 letters:
reptation

Word definitions for reptation in dictionaries

Wiktionary Word definitions in Wiktionary
n. 1 creep 2 (context physics English) A creeping thermal motion of entangled linear polymers

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Reptation \Rep*ta"tion\ (r?p-t?"sh?n), n. [L. reptatio, from reptare: cf. F. reptation.] (Zo["o]l.) The act of creeping.

Wikipedia Word definitions in Wikipedia
Reptation is the thermal motion of very long linear, entangled macromolecules in polymer melts or concentrated polymer solutions. Derived from the word reptile , reptation suggests the movement of entangled polymer chains as being analogous to snakes slithering ...