Town in Kent on the River Medway that formerly housed a Royal Navy Dockyard (7)

I believe the answer is:

chatham

(Other definitions for chatham that I've seen before include "N. Kent dockyard town" , "Historic Kent dockyard" , "Naval port" , "Kent ex-dockyard town" , "Town in north Kent" .)

I've seen this clue in The Mirror.

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