Crossword Genius

Something growing in factory (5)

Ross

I believe the answer is:

plant

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'factory' is the definition.
(a manufacturing plant)

I cannot understand how the rest of the clue works.

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(Other definitions for plant that I've seen before include "Growing organism - industrial buildings" , "Hide in order to be found" , "eg Flower" , "Put in the ground to grow" , "Factory; spy" .)

I've seen this clue in The Telegraph.
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