Her eldest could be mistaken for Lee (9)

I believe the answer is:

sheltered

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'mistaken for lee' is the definition.
Both the answer and definition are adjectives. Maybe you can see an association between them that I can't see?

'her eldest could be' is the wordplay.
'could be' indicates an anagram.
'her'+'eldest'='hereldest'
'hereldest' with letters rearranged gives 'SHELTERED'.

Can you help me to learn more?

(Other definitions for sheltered that I've seen before include "Hidden" , "Protected, as housing" , "Covered" , "in such accommodation?" , "Took cover; protected" .)

I've seen this clue in The Telegraph.

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