Crossword Genius

Is a sign able to reveal singers? (8)

Ross

I believe the answer is:

canaries

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

'singers?' is the definition.
(I've seen this in another clue)

'is a sign able' is the wordplay.
I cannot really understand how this works, but
'a' could be 'an' and 'an' is found within the answer.
'sign' could be 'aries' (star sign) and 'aries' is found in the answer.
A single letter 'c' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...

'to reveal' acts as a link.

Can you help me to learn more?

(Other definitions for canaries that I've seen before include "Yellow songbirds or Spanish islands off Africa" , "Yellow birds or islands off Africa" , "Small yellow finches" , "Group of islands in the Atlantic" , "The birds can arise" .)

I've seen this clue in The Daily Express.
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