Crossword Genius

Lecture by an Indian police constable (5)

Ross

I believe the answer is:

jawan

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'lecture' is the definition.
Both the answer and definition are singular nouns.
Perhaps you can see an association between them that I don't see?

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Another definition for jawan that I've seen is " Indian copper".)

I've seen this clue in The Times and The Sunday Times.
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