Very keen on country dialect feature? (10)

I believe the answer is:

intonation

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'dialect feature?' is the definition.
'intonation' can be an answer for 'feature?' (I have seen 'Feature of speech' mean 'intonation' so perhaps 'feature' could also mean 'intonation'). I am not certain of the 'dialect' bit.

'very keen on country' is the wordplay.
'very keen on' becomes 'into'.
'country' becomes 'nation' (synonyms).
'into'+'nation'='INTONATION'

Can you help me to learn more?

(Other definitions for intonation that I've seen before include "bit of plainsong" , "Feature of speech" , "Rise and fall in voice pitch" .)

I've seen this clue in The Independent.

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