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Last one,33a, Catching criminal, one fifth of prisoners put in river (10). c?n?a?i?u?
It must be 'contagious'. I can see that it's catching and where 'con' comes from but can someone explain the 'tagious' please?

The River Tagus is in the Iberian peninsula. The setter is using the letter i for one. the fifth letter of prisoners is o.

Thanks a lot. Hadn't heard of R Tagus.