Nigerian leads off immigrant grabbed by officer (4)

I believe the answer is:

igbo

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

'nigerian' is the definition.
(I know that Igbo is a type of nigerian)

I don't understand the remainder of the clue.

(Other definitions for igbo that I've seen before include "Nigerian language" , "people abroad" , "language in Nigeria" .)

I've seen this clue in The Times.

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.