Crossword Genius

Ruby red sealant? (3)

Ross

I believe the answer is:

wax

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

This could be a double definition.

'ruby' is the first definition.
The definition and answer can be both substances as well as being singular nouns.
Maybe you can see an association between them that I can't see?

'red sealant?' is the second definition.
The definition and answer can be both substances as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

Can you help me to learn more?

(Other definitions for wax that I've seen before include "Substance in candles" , "Cere - grow larger" , "Grow large" , "Increase (as moon's phase)" , "Yellow stuff secreted in ear" .)

I've seen this clue in the Evening Standard.
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