In case of self-defence, file away photo (6)

I believe the answer is:

selfie

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

'photo' is the definition.
(I know that selfie is a type of photo)

'in case of self-defence file away' is the wordplay.
'in' is an insertion indicator.
'case of' says to hollow out the word (remove centre letters) (like emptying a case).
'self-defence' becomes 'self-defense' (synonyms).
'file away' becomes 'elfi' (I am not sure about this - if you are sure you should believe this answer much more).
'selfdefense' with its centre taken out is 'se'.
'se' placed around 'elfi' is 'SELFIE'.

Can you help me to learn more?

(Other definitions for selfie that I've seen before include "Personal photo" , "21 [PHOTO]" .)

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.