Juliet in for diamonds in coastal inlet (5)

I believe the answer is:

fjord

I'm a little stuck... Click here to teach me more about this clue!

'coastal inlet' is the definition.
'fjord' can be an answer for 'inlet' (fjord is a kind of inlet). I am not certain of the 'coastal' bit.

'juliet in for diamonds' is the wordplay.
'juliet' becomes 'J' (phonetic alphabet: alpha, bravo, charlie etc.).
'in' indicates putting letters inside.
'diamonds' becomes 'd' (abbreviation in bridge say).
'j' placed within 'for' is 'fjor'.
'fjor'+'d'='FJORD'

'in' acts as a link.

Can you help me to learn more?

(Other definitions for fjord that I've seen before include "Norwegian inlet (J, not I)" , "part of Norway" , "Long narrow inlet" , "Sea inlet" , "Rocky inlet" .)

I've seen this clue in The Sun.

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