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Close to me, wanting a little peck, lips met to get working? (9)

Ross

I believe the answer is:

mistletoe

I'm a little stuck... Click here to teach me more about this clue!

'close' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for mistletoe that I've seen before include "Something to stand under when kissing?" , "Valley of the -, best seller by Jacqueline Susann" , "Tree parasite" , "Kissed-under plant" , "Yuletide hanging?" .)

I've seen this clue in The Times and The Sunday Times.
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