One brought in to identify the origin of a fish (6)

I believe the answer is:

plaice

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'origin of a fish' is the definition.
'plaice' can be an answer for 'fish' (plaice is a kind of fish). I am not sure about the 'origin of a' bit.

'one brought in to identify' is the wordplay.
'one' becomes 'I' (Roman numeral).
'brought in to' is an insertion indicator.
'identify' becomes 'place' (synonyms).
'i' placed into 'place' is 'PLAICE'.

'the' is the link.

Can you help me to learn more?

(Other definitions for plaice that I've seen before include "Location of the fish" , "Edible flatfish" , "Flat fare" , "Swimmer" , "Large flat fish" .)

I've seen this clue in The Irish News.

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