Variety of trout swallowing a piece of bait? (6)

I believe the answer is:

turbot

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'bait?' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'variety of trout swallowing a piece' is the wordplay.
'variety of' indicates anagramming the letters.
'swallowing' indicates putting letters inside.
'a piece' becomes 'b' (abbreviation for bishop).
'trout' with letters rearranged gives 'turot'.
'turot' going around 'b' is 'TURBOT'.

'of' acts as a link.

Can you help me to learn more?

(Other definitions for turbot that I've seen before include "Type of fish" , "Swimmer" , "[SOMETHING FISHY]" , "Large brownish European flatfish" , "Flatfish - trout B (anag)" .)

I've seen this clue in the Evening Standard.

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