Quantity of wine - fifty in broken crate (6)

I believe the answer is:

claret

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'quantity of wine' is the definition.
'claret' can be an answer for 'wine' (claret is a kind of wine). I am unsure of the 'quantity of' bit.

'fifty in broken crate' is the wordplay.
'fifty' becomes 'l' (Roman numeral).
'in' indicates putting letters inside.
'broken' is an anagram indicator.
'crate' is an anagram of 'caret'.
'l' inserted within 'caret' is 'CLARET'.

Can you help me to learn more?

(Other definitions for claret that I've seen before include "Purplish-red - blood" , "Deep purplish-red" , "Type of red wine" , "Dry red wine of Bordeaux" , "Deep purplish colour" .)

I've seen this clue in The Irish News.

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