Young person being dozy can cause offence (10)

I believe the answer is:

kidnapping

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

'young person being dozy can' is the wordplay.
'young person' becomes 'kid' (a child).
'being dozy can' becomes 'napping' (I can't explain this - if you can you should believe this answer much more).
'kid'+'napping'='KIDNAPPING'

'cause' is the link.

Can you help me to learn more?

(Other definitions for kidnapping that I've seen before include "Abducting" , "Abduction" , "displaying criminality" , "offence" .)

I've seen this clue in The Independent.

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