Prominent feature of chief country (8)

I believe the answer is:

headland

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'prominent feature' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

'chief country' is the wordplay.
'chief' becomes 'head' (synonyms).
'country' becomes 'land' (synonyms).
'head'+'land'='HEADLAND'

'of' is the link.

Can you help me to learn more?

(Other definitions for headland that I've seen before include "Bill" , "Cape" , "Narrow promontory" , "Promontory, area jutting out into the sea" , "Promontory, territory jutting out into the sea" .)

I've seen this clue in The Irish News.

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