Crossword Genius

See a sign of dental trouble (6)

Ross

I believe the answer is:

caries

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'dental trouble' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

'see a sign' is the wordplay.
'see' becomes 'c' (the word for the letter, according to Chambers).
'a sign' becomes 'aries' (star sign).
'c'+'aries'='CARIES'

'of' is the link.

Can you help me to learn more?

(Other definitions for caries that I've seen before include "Decay in bones or teeth (6)" , "Decayed areas in teeth" , "Decay of bone or teeth" , "Dental cavities" , "Dental decay" .)

I've seen this clue in the Evening Standard.
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