Kids stealing a cake turned out to be urchins (11)

I believe the answer is:

ragamuffins

I'm a little stuck... Click here to teach me more about this clue!

'be urchins' is the definition.
(I've seen this before)

'kids stealing a cake turned out' is the wordplay.
I cannot really see how this works, but
'a' is present in the answer.
'cake' could be 'muffin' (I've seen this before) and 'muffin' is located in the answer.
This explanation may well be incorrect...

'to' is the link.

Can you help me to learn more?

(Another definition for ragamuffins that I've seen is " Urchins".)

I've seen this clue in The Hindu.

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