Crossword Genius

It's a different tree, lad! (7)

Ross

I believe the answer is:

altered

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'it's a' is the definition.
I can't judge whether this defines the answer.

'different tree lad' is the wordplay.
'different' indicates an anagram (letters placed in a different order).
'tree'+'lad'='treelad'
'treelad' is an anagram of 'ALTERED'.

Can you help me to learn more?

(Other definitions for altered that I've seen before include "Change" , "Changed, adapted" , "Different" , "Reformed" , "Changed, modified" .)

I've seen this clue in the Evening Standard.
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