Crossword Genius

Nova Scotia saving energy with revolutionary selenium insulators? (3,6)

Ross

I believe the answer is:

tea cosies

I'm a little stuck... Click here to teach me more about this clue!

'revolutionary selenium insulators?' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'nova scotia saving energy' is the wordplay.
I cannot quite see how this works, but
'energy' could be 'ac' (AC is an example) and 'ac' is located in the answer.
This may be the basis of the clue (or it may be nonsense).

'with' is the link.

Can you help me to learn more?

I've seen this clue in The Independent.
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