The most common and most likely answer to this crossword clue is the 5 letter word NISEI
I've seen this crossword clue in Financial Times
N
I
S
E
I
More clues leading to the result NISEI
- That is wrong about Japanese immigrants’ child
- Child of immigrant couple that is beginning to settle in after upheaval?
- Second generation immigrant in Washington is eighteen
- North American native that is wrong to be upset
- Second generation immigrant in Boston is 8
- Welcomed back by enemies, industrious Japanese American
- Japanese-American in thirties interviewed for promotion
- That is the wrong lift for the offspring of a Japanese immigrant
- Japanese ABCD?
- Some Japanese Americans organise immigration in part
Buddy explains!

The straight part
We know that "Second generation immigrant" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case second generation immigrant = nisei.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does NISEI mean?
NISEI noun- An American or Canadian whose parents were Japanese immigrants