The most common and most likely answer to this crossword clue is the 12 letter word ECONOMETRICS
I've seen this crossword clue in The Times
E
C
O
N
O
M
E
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I
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S
Buddy explains!
The straight part
We know that "Analytical way of looking at income sector?/income sector" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case analytical way of looking at income sector?/income sector = econometrics.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 ECONOMETRICS mean?
ECONOMETRICS noun- The branch of economics that applies statistical methods to the empirical study of economic theories and relationships.