King is in Paris to get insignia (5)

I believe the answer is:

crest

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'insignia' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

'king is in paris' is the wordplay.
'king' becomes 'CR' (short for Carolus Rex, King Charles in Latin).
'is in paris' becomes 'est' ('is' in French).
'cr'+'est'='CREST'

'to get' acts as a link.

Can you help me to learn more?

(Other definitions for crest that I've seen before include "top position" , "Top (of wave etc)" , "Crown, peak, summit" , "Plume on a helmet" , "Summit - emblem - cockscomb" .)

I've seen this clue in The Independent.

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