"It's all good" (2,4,4)
(Other definitions for no sweat that I've seen before include "OK" , "in Australia with ease" , "That's a piece of cake (anti-perspirant unnecessary!)" , "fine" , "It's not a problem (result of using antiperspirant?)" .)
'it's all good' is the definition.
(I've seen this in another clue)
This is all the clue.
(Another definition for no harm done that I've seen is " injury averted".)