Influenced cop at nude romp (5,4)

Ross

I believe the answer is:

acted upon

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'influenced' is the definition.
('act upon' can be a synonym of 'influence')

'cop at nude romp' is the wordplay.
'cop at nude' anagrams to 'ACTED UPON'.
Though, I am not sure how the anagram is indicated.

Can you help me to learn more?

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

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