This may be over the pecking order (9)

I believe the answer is:

mistletoe

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'this may be over the pecking order' is the definition.
The answer and definition can be both plants as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

This is all the clue.

Can you help me to learn more?

(Other definitions for mistletoe that I've seen before include "Kissed-under plant" , "Stole mite from the Christmas plant" , ""Kissing" sprig" , "Plant used as Christmas decoration" , "Viscum album, much sought-after around Christmas" .)

I've seen this clue in The Telegraph.

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