Think of Americans (5)

I believe the answer is:

guess

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This clue might be a double definition.

'think' is the first definition.
(synonyms)

'of americans' is the second definition.
The definition suggests a singular noun which matches the answer.

Can you help me to learn more?

(Other definitions for guess that I've seen before include "Hypothesis" , "Conjecture - estimate" , "Estimate; suppose" , "Estimate on the basis of little information" , "Divine - estimate" .)

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

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