Some scary bleeding trees (9)

I believe the answer is:

sycamores

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

'trees' is the definition.
(sycamore is a kind of tree)

'some scary bleeding' is the wordplay.
'some scary' anagrams to 'SYCAMORES'.
However, I'm not sure how the anagram is indicated.

Can you help me to learn more?

(Another definition for sycamores that I've seen is " US planes".)

I've seen this clue in The Independent.

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