Detailing for systematic storage (9)

I believe the answer is:

profiling

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

'detailing' is the definition.
Although both the answer and definition are present participle verbs, I can't understand how they can define each other.

'for systematic storage' is the wordplay.
'for' becomes 'pro' (as in being 'pro' something).
'systematic storage' becomes 'filing' (filing is a kind of storage. I am not sure about the 'systematic' bit.).
'pro'+'filing'='PROFILING'

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.

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.