Country lacking a prominent feature (4)

I believe the answer is:

chin

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'prominent feature' is the definition.
(facial feature)

I don't understand how the remainder of the clue works.

(Other definitions for chin that I've seen before include "Front of lower jaw" , "Lower face part" , "Jutting part of lower jaw" , "Keep it up and be optimistic" , "Prominent feature" .)

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

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