Mature? One’s a pig, mad for cake (8,6)

I believe the answer is:

victoria sponge

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'cake' is the definition.
(type of cake)

'mature? one's a pig mad' is the wordplay.
'mature?' becomes 'victor' (I can't explain this - if you can you should give a lot more credence to this answer).
'mad' indicates an anagram.
'ones'+'a'+'pig'='onesapig'
'onesapig' with letters rearranged gives 'iasponge'.
'victor'+'iasponge'='VICTORIA SPONGE'

'for' acts as a link.

Can you help me to learn more?

(Another definition for victoria sponge that I've seen is " cake".)

I've seen this clue in The Sunday Times and The Times.

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