Scamps tease when pinching cake (11)

I believe the answer is:

ragamuffins

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'scamps' is the definition.

'tease when pinching cake' is the wordplay.
'tease when' becomes 'ragas' (I can't justify this - if you can you should believe this answer much more).
'pinching' is an insertion indicator (taking inside).
'cake' becomes 'muffin' (I've seen this before).
'ragas' going around 'muffin' is 'RAGAMUFFINS'.

Can you help me to learn more?

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

I've seen this clue in The Telegraph.

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