Times Jumbo 980

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1a Eight-and-a-third-foot piece of cake? (5) Answer seems to be CINCH. Can someone explain why, please? Thanks.

[bibblebub]

8 1/3 feet = 100 inches = C inch - C being the Roman numeral

[bibblebub]

and if something's a cinch then it can be said to be a piece of cake

[bibblebub]

and (for completeness) because it says 'foot' in the clue rather than 'feet' that is why it is 'inch' in the answer and not 'inches'

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Thanks for your very explicit answer, B.

[bibblebub]

you're welcome