It certainly makes you wonder! (6)

I believe the answer is:

marvel

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'wonder' is the definition.
(I know that wonder can be written as marvel)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for marvel that I've seen before include "Express astonishment" , "Be filled with surprise or wonder" , "Wonder, be astonished" , "Amazing person or event" , "Be filled with wonder - something wondrous" .)

I've seen this clue in the Evening Standard.

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