Blow one's stack (5)
I believe the answer is:
erupt
'blow one's stack' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for erupt that I've seen before include "Break forth" , "Burst forth, like 25" , "Spurt lava" , "Break through (as a volcano)" , "go up" .)