Herb associated with Don in Essex town (5)

I believe the answer is:

basil

I believe this is a double definition.

'herb' is the first definition.
(basil is a herb)

'associated with don in essex town' is the second definition.
(Basildon is the name of a town in Essex)

(Other definitions for basil that I've seen before include "A herb; --- Brush, Fawlty" , "A herb; Cardinal --- Hume" , "Herb; forename" , "Mediterranean herb" , "Aromatic leaves, used fresh or dried" .)

I've seen this clue in The Times.

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