Factory transformed into a cultivated area (10)

I believe the answer is:

plantation

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'cultivated area' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'factory transformed into a' is the wordplay.
'factory' becomes 'plant' (I've seen this before).
'transformed' indicates an anagram.
'into'+'a'='intoa'
'intoa' with letters rearranged gives 'ation'.
'plant'+'ation'='PLANTATION'

Can you help me to learn more?

(Other definitions for plantation that I've seen before include "Coffee-growing estate" , "settlement" , "growth area" , "Cotton, slave, estate" , "land for crops" .)

I've seen this clue in The Times.

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