Childhood interest of archaeologists? (5,3)

I believe the answer is:

early age

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This might be a double definition.

'childhood' is the first definition.
Both the definition and answer are singular nouns.
Perhaps they are linked in a way I don't understand?

'interest of archaeologists?' is the second definition.
The definition suggests a singular noun which matches the answer.

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I've seen this clue in The Globe and Mail.

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