Tedious spell collecting cycled mineral aggregates (8)

I believe the answer is:

tiresome

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'tedious' is the definition.
(I know that tedious can be written as tiresome)

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

Can you help me to learn more?

(Other definitions for tiresome that I've seen before include "Is remote, being boring" , "wearing" , "Wearying" , "Aggravating" , "Boring, annoying" .)

I've seen this clue in The Telegraph.

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