Evoke such unrestrained happiness (6)

I believe the answer is:

elicit

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'evoke' is the definition.
(I know that evoke can be written as elicit)

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

Can you help me to learn more?

(Other definitions for elicit that I've seen before include "Bring out - evoke" , "Draw out (response, information etc)" , "Draw out, call forth" , "Bring to light" , "Get out" .)

I've seen this clue in the Sydney Morning Herald.

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