Additionally tempting (7)

I believe the answer is:

moreish

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'tempting' is the definition.
Both the answer and definition are adjectives.
Maybe they are linked in a way I don't understand?

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Another definition for moreish that I've seen is " addictive".)

I've seen this clue in the Evening Standard.

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