Crossword Genius

Holly aims to leave Emirates (4)

Ross

I believe the answer is:

tree

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'holly' is the definition.
(thesaurus)

I can't explain the remainder of the clue.

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(Other definitions for tree that I've seen before include "- Frog; - house" , "A number" , "elder, maybe" , "Genealogy chart" , "Woody growth" .)

I've seen this clue in the Irish Times.
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