Be generous with some incriminating information? (4,4)
I believe the answer is:
give away
I believe this is a double definition.
'be generous' is the first definition.
'some incriminating information?' is the second definition.
'with' is the link.
(Other definitions for give away that I've seen before include "Freebie" , "Present the bride" , "Reveal - betray - donate" , "Free promotional item" , "Something, perhaps lapse, that reveals a secret (4-4)" .)