Discover bit by bit (5)
I believe the answer is:
glean
'discover bit by bit' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for glean that I've seen before include "Gather (grain) after a harvest" , "Angle (anag.)" , "Collect gradually (from various sources)" , "Pull together from various sources" , "Gather (information) bit by bit" .)