The most common and most likely answer to this crossword clue is the 9 letter word PINPOINTS
I've seen this crossword clue in The Guardian
P
I
N
P
O
I
N
T
S
Buddy explains!
The straight part
We know that "Homes in on /Homes in on" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case homes in on /homes in on = pinpoints.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 PINPOINTS mean?
PINPOINTS noun- The point of a pin.
- To identify or locate precisely or with great accuracy.