Crossword Genius

Industrialist's housing experiment (5)

Ross

I think it could be either:

error

trial
I'm a little stuck... Click here to teach me more about this clue!

This could be a double definition.

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

'housing experiment' is the second definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps there's a link between them I don't understand?

Can you help me to learn more?

(Other definitions for error that I've seen before include "Mistake, lapse" , "A mistake or inaccuracy" , "Blunder or mistake" , "Slip-up" , "Bloomer, blunder" .)

I've seen this clue in The Guardian.
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