Restrictive practice a signal to turn nasty (13)

I believe the answer is:

strangulation

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'restrictive practice' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe you can see a link between them that I don't see?

'a signal to turn nasty' is the wordplay.
'nasty' indicates anagramming the letters (a nasty or wrong spelling).
'a'+'signal'+'to'+'turn'='asignaltoturn'
'asignaltoturn' anagrammed gives 'STRANGULATION'.

Can you help me to learn more?

(Other definitions for strangulation that I've seen before include "The choking off of a flow" , "Act of choking" , "The choking off of a blood vessel" , "murder" , "Process of choking" .)

I've seen this clue in The Times.

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