Copter carrying corrupt cop's cake (4,5)

I believe the answer is:

drop scone

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

'copter carrying corrupt cop's' is the wordplay.
'copter' becomes 'drone' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'carrying' is an insertion indicator.
'corrupt' is an anagram indicator (a corrupted spelling of the word).
'cops' is an anagram of 'psco'.
'drone' enclosing 'psco' is 'DROP-SCONE'.

Can you help me to learn more?

(Other definitions for drop scone that I've seen before include "Scotch pancake" , "Small and thick pancake" , "cake" , "Eating" , "Girdlecake" .)

I've seen this clue in The Independent.

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