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Old hat only brought in to be re-blocked (8)

Ross

I believe the answer is:

obsolete

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'old hat' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for obsolete that I've seen before include "Outmoded, passe" , "No longer current" , "Boots eel away, being out of date" , "Pass" , "Dead" .)

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