Break and bury assignment (12)
I believe the answer is:
intermission
'break' is the definition.
(synonyms)
'bury assignment' is the wordplay.
'bury' becomes 'inter' (to inter is to put into the ground).
'assignment' becomes 'mission' (mission is a kind of assignment).
'inter'+'mission'='INTERMISSION'
'and' is the link.
(Other definitions for intermission that I've seen before include "Entr'acte" , "Interval" , "Theatre's half-time" , "Pause, break" , "Break; respite" .)