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It's essential to most Latvians, possibly (5)

Ross

I believe the answer is:

vital

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'it's essential' is the definition.
(similar in meaning)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for vital that I've seen before include "Essential to life, indispensable" , "Essential to life or critically important" , "Essential, life-giving" , "Critical, necessary" , "Crucially important, essential" .)

I've seen this clue in the Evening Standard.
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