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29 ac: Worker in the field is a tiresome sort about recycling CERN equipment (6,6).

I think the answer is “Border Collie” (Worker in the field). A tiresome sort is a bore, but I cannot see how “recycling CERN equipment” fits in. Any suggestions?

Recycling collider => dercolli within bore

Cern (Hadron) collider

Thanks for your replies. I am familiar with the LHC: it was the recycling that confused me.