Intense group are quite depressed (4-3)

I believe the answer is:

deep-set

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'quite depressed' is the definition.
The answer and definition are different parts of speech. However, past participle verbs and adjectives occasionally mean the same thing.

'intense group' is the wordplay.
'intense' becomes 'deep' (similar in meaning).
'group' becomes 'set' (both can mean a collection).
'deep'+'set'='DEEP-SET'

'are' is the link.

Can you help me to learn more?

(Another definition for deep-set that I've seen is " Firmly embedded".)

I've seen this clue in The Irish Times.

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