Manage to expose less of that! (3,2,3)
I believe the answer is:
cut it out
'less of that' is the definition.
(both are ways of telling someone to stop something)
'manage to expose' is the wordplay.
'manage' becomes 'cutit' (to 'cut it' is to manage or cope in a situation).
'to expose' becomes 'out' (outing is a kind of exposing).
'cutit'+'out'='CUT IT OUT'
(Other definitions for cut it out that I've seen before include "Don't!" , "In slang, stop doing that - use scissors?" , "Stop that - maybe with scissors" , "Prepare to submit your solution" , "Belt up! (informal)" .)