Liberal judge hates Euro-American national park (6,4)

I believe the answer is:

joshua tree

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'liberal judge hates euro-american national park' is the definition.
I can't tell whether this definition defines the answer.

'liberal judge hates euro' is the wordplay.
'liberal' is an anagram indicator.
'judge' becomes 'J' (abbreviation for judge).
'j'+'hates'+'euro'='jhateseuro'
'jhateseuro' is an anagram of 'JOSHUA TREE'.

Can you help me to learn more?

(Another definition for joshua tree that I've seen is " plant".)

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