Useful information on public profile (7)
I believe the answer is:
outline
'profile' is the definition.
(I've seen this before)
'useful information on public' is the wordplay.
'useful information' becomes 'line' (I have seen 'classified information' mean 'line' so perhaps 'information' could also mean 'line'. I am not sure about the 'useful' bit.).
'on' says to put letters next to each other.
'public' becomes 'out' (out can mean released to the public).
'line' after 'out' is 'OUTLINE'.
Can you help me to learn more?
(Other definitions for outline that I've seen before include "Preliminary plan or summary of main points" , "Give a summary of" , "Sketch, delineate" , "Profile" , "Trace - form" .)