Seafood sauce artist knocked back in small harbour (8)

I believe the answer is:

marinara

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'seafood sauce' is the definition.
'marinara' can be an answer for 'sauce' (marinara is a kind of sauce). I am not sure about the 'seafood' bit.

'artist knocked back in small harbour' is the wordplay.
'artist' becomes 'RA' (Royal Academician, member of Royal Academy of Arts).
'knocked back' says the letters should be written backwards.
'in' is an insertion indicator.
'small harbour' becomes 'marina' (I've seen this before).
'ra' written backwards gives 'ar'.
'ar' put within 'marina' is 'MARINARA'.

Can you help me to learn more?

I've seen this clue in The Times.

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