Find out what's allowed online? (6)
I believe the answer is:
elicit
'find out' is the definition.
(as in eliciting information)
I don't understand the rest of the clue.
(Other definitions for elicit that I've seen before include "Bring to light" , "Take or draw from" , "Draw out (response, information etc)" , "Draw out, information or explanation" , "Bring something out into the open" .)