The most sizeable rat’s leg broken (7)

I believe the answer is:

largest

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'the most sizeable' is the definition.
I can't tell whether this defines the answer.

'rat's leg broken' is the wordplay.
'broken' indicates anagramming the letters.
'rats'+'leg'='ratsleg'
'ratsleg' with letters rearranged gives 'LARGEST'.

Can you help me to learn more?

(Other definitions for largest that I've seen before include "Chief" , "Most ample" , "Most substantial" , "Biggest" , "Superlatively extensive" .)

I've seen this clue in the Sydney Morning Herald.

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