Introduction of legal submission removing parental guidance (6)

I believe the answer is:

leadin

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

'introduction of legal submission removing parental' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'guidance' is the wordplay.
I cannot really see how this works, but
'guidance' could be 'lead' (lead is a kind of guidance) and 'lead' is present in the answer.
The remaining letters 'in' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Irish Times.

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