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I am surrounded by rambling roses and trees (6)

Ross

I believe the answer is:

osiers

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

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

'i am surrounded by rambling roses' is the wordplay.
I cannot quite understand how this works, but
'i' is present in the answer.
an anagram of 'roses' is 'osers' which is located in the remaining letters.
No letters remain.
This explanation may well be incorrect...

'and' acts as a link.

Can you help me to learn more?

(Other definitions for osiers that I've seen before include "Small willows" , "Willow twigs used in basket-work" , "Kind of willows for weaving - Rosie's?" , "Roses I find with flexible willow twigs" , "Willow twigs used in basket-making" .)

I've seen this clue in The Globe and Mail.
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