Fake American policeman in New York (6)

I believe the answer is:

shamus

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

'policeman in new york' is the definition.
The definition suggests a singular noun which matches the answer.

'fake american' is the wordplay.
'fake' becomes 'sham' (sham can mean fake or pretend).
'american' becomes 'US' (abbreviation for United States).
'sham'+'us'='SHAMUS'

Can you help me to learn more?

(Another definition for shamus that I've seen is " Busy American".)

I've seen this clue in The Independent.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.