Scottish chemist in action after idea uncovered? (5)

I believe the answer is:

dewar

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'scottish chemist' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

'action after idea uncovered?' is the wordplay.
'action' becomes 'war' (war is a kind of action**).
'after' is a charade indicator (letters next to each other).
'uncovered?' means to look at the middle letters.
The middle of 'idea' is 'de'.
'war' after 'de' is 'DEWAR'.

'in' acts as a link.

Can you help me to learn more?

(Another definition for dewar that I've seen is " Low-temperature flask".)

I've seen this clue in The Telegraph.

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