Bust a breather (5)
I believe the answer is:
break
This clue is a double definition.
'bust' is the first definition.
(I know that bust is a kind of break)
'a breather' is the second definition.
(thesaurus)
(Other definitions for break that I've seen before include "Interruption" , "Interrupt; holiday" , "accumulation of points" , "Holiday - destroy" , "Better opportunity" .)