Crossword Genius

Steal away when the child goes to sleep (6)

Ross

I believe the answer is:

kidnap

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

'steal away' is the definition.
Although both the answer and definition are verbs in their base form, I can't understand how they can define each other.

'the child goes to sleep' is the wordplay.
'the child' becomes 'kid' ('kid' can be a synonym of 'child').
'goes to' is a charade indicator (letters next to each other).
'sleep' becomes 'nap' (a nap is a short sleep).
'kid'+'nap'='KIDNAP'

'when' is the link.

Can you help me to learn more?

(Other definitions for kidnap that I've seen before include "Seize, usually for ransom" , "Seize and hold for ransom" , "Small island" , "Abduct (a person)" , "deprive it of liberty" .)

I've seen this clue in the Evening Standard.
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