Risky, critical (5,3,2)
I believe the answer is:
touch and go
I believe this is a double definition.
'risky' is the first definition.
(I've seen this before)
'critical' is the second definition.
(I've seen this before)
(Other definitions for touch and go that I've seen before include "advice recommending the briefest of contacts?" , "Precarious" , "fleeting contact" , "Risky advice" , "Fraught with danger" .)