Vegetable provided in leap day spread (4,3)

I believe the answer is:

lady pea

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'vegetable provided' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'leap day spread' is the wordplay.
I cannot really understand how this works, but
an anagram of 'day' is 'ady' which is present in the answer.
an anagram of 'leap' is 'lpea' which is located in the left over letters.
This accounts for all the letters.
This explanation may well be incorrect...

'in' acts as a link.

Can you help me to learn more?

I've seen this clue in The Irish Times.

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