Crossword Genius

Ash covering street (4)

Ross

I believe the answer is:

tree

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

'ash' is the definition.
(thesaurus)

'covering street' is the wordplay.
'TREE' is hidden in amongst the letters.
But, I'm unsure how this is indicated.

Can you help me to learn more?

(Other definitions for tree that I've seen before include "Oak, say" , "Laurel, perhaps" , "Branching diagram" , "Eg, alder" , "Forest plant" .)

I've seen this clue in The Mirror.
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