This ring is impressive (6)

I believe the answer is:

signet

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

'this ring' is the definition.
(signet ring is a kind of ring)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for signet that I've seen before include "Tinges (anag) - seal" , "Ingest (anag)" , "Little seal" , "Official seal" , "Finger-ring with engraved design" .)

I've seen this clue in The Globe and Mail.

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