Crossword Genius

Premium cut of lamb son stewed with cousin (2-6,5)

Ross

I believe the answer is:

no-claims bonus

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'premium cut' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.

'lamb son stewed with cousin' is the wordplay.
'stewed with' is an anagram indicator.
'lamb'+'son'='lambson'
'lambson' with its letters mixed up with 'cousin' makes 'NO-CLAIMS BONUS'.

'of' acts as a link.

Can you help me to learn more?

(Other definitions for no-claims bonus that I've seen before include "Insurance premium reduction after a period without a prang, for example in a car" , "Insurance benefit" , "Insurance discount" .)

I've seen this clue in The Telegraph.
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