Surprisingly, many falling in with parking issue regulation (6,8)

I believe the answer is:

family planning

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'regulation' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'surprisingly many falling in with parking' is the wordplay.
'surprisingly' indicates anagramming the letters (a surprising ordering of the letters).
'with' is an insertion indicator.
'parking' becomes 'p' (abbreviation on road signs).
'many'+'falling'+'in'='manyfallingin'
'manyfallingin' is an anagram of 'familylanning'.
'familylanning' placed around 'p' is 'FAMILY PLANNING'.

'issue' is the link.

Can you help me to learn more?

I've seen this clue in The Times.

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