The most common and most likely answer to this crossword clue is the 9 letter word AUTOFOCUS
I've seen this crossword clue in The Daily Telegraph
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More clues leading to the result AUTOFOCUS
Buddy explains!
The straight part
We know that "Setting required for a selfie?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case setting required for a selfie? = autofocus.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 AUTOFOCUS mean?
AUTOFOCUS noun- A feature of some cameras and other optical systems that allows a correct focus on the subject to be obtained automatically
- To focus automatically.