Don joins him somewhere in Essex (5)

I believe the answer is:

basil

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But I can't explain it at all! Could you help me understand?

(Other definitions for basil that I've seen before include "Aromatic plant used as a herb" , "Herb of mint family" , "Culinary herb" , "Culinary plant" , "Herb (from Fawlty Towers?)" .)

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