Police show vandalised NY outfield (4,2,4)

I believe the answer is:

line of duty

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

'vandalised ny outfield' is the wordplay.
'vandalised' is an anagram indicator.
'ny'+'outfield'='nyoutfield'
'nyoutfield' with letters rearranged gives 'LINE OF DUTY'.

Can you help me to learn more?

I've seen this clue in The Independent.

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