Being behind babysitting young lad? (13)

I believe the answer is:

masterminding

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'babysitting young lad?' is the definition.
Although both the answer and definition are present participle verbs, I can't understand how one could define the other.

'being behind' is the wordplay.
I cannot really see how this works, but
'being' could be 'mastermind' (mastermind is a kind of being) and 'mastermind' is located in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Another definition for masterminding that I've seen is " Organising".)

I've seen this clue in the Sydney Morning Herald.

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