Uncast replacements? (5,5)
I believe the answer is:
spare parts
'replacements?' is the definition.
(I've seen this before)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(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" .)