Crossword Genius

Confectionery set made of light material (7)

Ross

I believe the answer is:

aerogel

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

'light material' is the definition.
(I've seen this before)

'confectionery set' is the wordplay.
'confectionery' becomes 'aero' (I can't justify this - if you can you should believe this answer much more).
'set' becomes 'gel' (both can mean to harden).
'aero'+'gel'='AEROGEL'

'made of' is the link.

Can you help me to learn more?

(Another definition for aerogel that I've seen is " light material".)

I've seen this clue in The Irish Times.
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