Cryptic crossword clue
Inventor of the vacuum flask, part inside warmer? 5

The most common and most likely answer to this crossword clue is the 5 letter word DEWAR

I've seen this crossword clue in The Guardian
D
E
W
A
R

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What does DEWAR mean?

DEWAR noun
  1. A vacuum flask; a vessel which keeps its contents hotter or cooler than their environment without the need to modify the pressure, by interposing an evacuated region to provide thermal insulation between the contents and the environment.

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