Pure chaos - time to blow up (5)
I believe the answer is:
erupt
'blow up' is the definition.
(I've seen this before)
'pure chaos time' is the wordplay.
'chaos' indicates anagramming the letters.
'time' becomes 't' (abbreviation).
'pure' anagrammed gives 'erup'.
'erup'+'t'='ERUPT'
'to' is the link.
(Other definitions for erupt that I've seen before include "Break out like Etna" , "Break through (as a volcano)" , "spout" , "Burst forth violently" , "Spurt lava" .)