Crossword Genius

Uncast replacements? (5,5)

Ross

I believe the answer is:

spare parts

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'replacements?' is the definition.
(I've seen this before)

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

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(Other definitions for spare parts that I've seen before include "offered for replacements" , "Replacement components" , "accessories" , "Pare straps (anag.)" , "Don't be merciless on everything" .)

I've seen this clue in The Globe and Mail, The Guardian, The Irish Independent and The Telegraph.
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