Temporary break ruins routine print (12)
I believe the answer is:
interruption
'temporary break' is the definition.
(an interruption is a break or pause)
'ruins routine print' is the wordplay.
'ruins' is an anagram indicator.
'routine'+'print'='routineprint'
'routineprint' is an anagram of 'INTERRUPTION'.
(Other definitions for interruption that I've seen before include "Something breaking continuity" , "Temporary cessation" , "Break in continuity" .)