Echo about coastal inlet (7)

I believe the answer is:

resound

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'echo' is the definition.
(I know that echo can be written as resound)

'about coastal inlet' is the wordplay.
'about' becomes 're' ('re' means regarding or about).
'coastal inlet' becomes 'sound' (I've seen this in another clue. I am not sure about the 'coastal' bit.).
're'+'sound'='RESOUND'

Can you help me to learn more?

(Other definitions for resound that I've seen before include "Echo" , "Reverberate" , "ring" .)

I've seen this clue in The Everyman puzzle in The Observer.

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