Crossword Genius

Way of saving face, so only come in disguise (7)

Ross

I think it could be either:

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7

7,2,5

economy of scale

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'way of saving' is the definition.

I don't understand how the rest of the clue works.

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(Another definition for economy of scale that I've seen is " Sizeable savings".)

I've seen this clue in The Guardian.
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