Those in the leaves of tangled vines? (5)

I believe the answer is:

veins

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

'those in the leaves' is the definition.
The definition suggests an adverb but the answer is not.

'tangled vines?' is the wordplay.
'tangled' indicates an anagram.
'vines' with letters rearranged gives 'VEINS'.

'of' acts as a link.

Can you help me to learn more?

(Other definitions for veins that I've seen before include "Characteristic styles" , "Circulation aids" , "Blood vessels" , "Layers of ore" .)

I've seen this clue in the Evening Standard.

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