Think of America (5)

I believe the answer is:

guess

I'm a little stuck... Click here to teach me more about this clue!

This clue might be a double definition.

'think' is the first definition.
(synonyms)

'america' is the second definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'of' acts as a link.

Can you help me to learn more?

(Other definitions for guess that I've seen before include "Speculate" , "Estimate, supposition" , "Hypothesis" , "Estimate; suppose" , "Theory" .)

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

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