Something sweet in the garden? (3)

I believe the answer is:

pea

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'sweet in the garden?' is the definition.
The definition and answer can be both things that one consumes for nourishment as well as being singular nouns.
Perhaps there's a link between them I don't understand?

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for pea that I've seen before include "Seed eaten as vegetable" , "Vegetable in a whistle" , "Leguminous vegetable" , "Climbing plant; vegetable" , "Legume" .)

I've seen this clue in the Evening Standard.

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