Fruit for worker found in flat areas (9)

I believe the answer is:

plantains

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'flat areas' is the definition.
Although both the answer and definition are plural nouns, I cannot understand how they can define each other.

'fruit for worker found in' is the wordplay.
'fruit for' becomes 'plains' (I am not sure about this - if you are sure you should believe this answer much more).
'worker' becomes 'ant' (worker is a type of ant).
'found in' means one lot of letters goes inside another.
'plains' placed around 'ant' is 'PLANTAINS'.

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I've seen this clue in the Sydney Morning Herald.

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