Distinguished knight's armour? (7)

I believe the answer is:

shining

I believe this is a double definition.

'distinguished' is the first definition.
(as in a shining example)

'knight's armour?' is the second definition.
(as in a knight in shining armour)

(Other definitions for shining that I've seen before include "Radiant" , "Effulgent" .)

I've seen this clue in The Guardian.

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