Crossword Genius

Identical line contributed to ruler showing star quality (9)


I believe the answer is:


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'star quality' is the definition.
Both the answer and definition are singular nouns.
Maybe there's a link between them I don't understand?

'identical line contributed to ruler showing' is the wordplay.
'identical' becomes 'twin' (I've seen this in another clue).
'line' becomes 'l' (used when specifying particular lines from a poem).
'contributed to' means one lot of letters goes inside another.
'ruler showing' becomes 'king' (I am not sure about this - if you are sure you should believe this answer much more).
'l' put inside 'king' is 'kling'.

Can you help me to learn more?

(Other definitions for twinkling that I've seen before include "Second" , "Jiffy" , "Sparkling - moment" , "Sparkling like a star" , "Instant" .)

I've seen this clue in The Guardian.
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