Attempt by government to leak information (2,6)
I believe the answer is:
go public
'leak information' is the definition.
'attempt by government' is the wordplay.
'attempt' becomes 'go' (go is a kind of attempt).
'by' is a charade indicator (letters next to each other).
'government' becomes 'public' (as in the public sector).
'go'+'public'='GO PUBLIC'
'to' is the link.
(Other definitions for go public that I've seen before include "Reveal details of a previously private matter" , "Become a company with traded shares" , "Come out" , "Make widely known" , "release information" .)