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Depressed, naive and a shade ambiguous (9)

Ross

I believe the answer is:

bluegreen

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'a shade ambiguous' is the definition.
I know nothing about this answer so I can't tell whether this works.

'depressed naive' is the wordplay.
'depressed' becomes 'blue' (I've seen this in another clue).
'naive' becomes 'green' (similar in meaning).
'blue'+'green'='BLUEGREEN'

'and' is the link.

Can you help me to learn more?

I've seen this clue in The Daily Express.
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