Rush to articulate coastal town (9)

I believe the answer is:

dartmouth

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'articulate coastal town' is the definition.
The definition suggests a singular noun which matches the answer.

'rush to' is the wordplay.
'rush' becomes 'dart' (both can mean to move quickly).
'to' becomes 'mouth' (I can't justify this - if you can you should believe this answer much more).
'dart'+'mouth'='DARTMOUTH'

Can you help me to learn more?

(Other definitions for dartmouth that I've seen before include "Devon town" , "Devon resort" , "Location of Britannia Royal Naval College" , "port" .)

I've seen this clue in The Daily Express.

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