A fruit tree's top in country food (12)

I believe the answer is:

alimentation

'food' is the definition.
(formal term for food or nourishment)

'a fruit tree's top in country' is the wordplay.
I cannot really understand how this works, but
'a' is found in the answer.
'fruit' could be 'lime' (lime is a kind of fruit) and 'lime' is found within the answer.
This explanation may well be incorrect...

(Another definition for alimentation that I've seen is " Nourishment".)

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