Mad American‘s signal to bring in unruly pack (7)

I believe the answer is:

cupcake

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'mad american's signal to bring in unruly pack' is the definition.
I can't tell whether this definition defines the answer.

'signal to bring in unruly pack' is the wordplay.
'signal' becomes 'cue' (as in an actor's cue).
'to bring in' indicates putting letters inside.
'unruly' is an anagram indicator.
'pack' anagrammed gives 'pcak'.
'cue' enclosing 'pcak' is 'CUPCAKE'.

Can you help me to learn more?

(Other definitions for cupcake that I've seen before include "Iced bun" , "Iced fancy" , "Small baked item" , "Small iced delicacy" .)

I've seen this clue in The Independent.

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