To avoid the odd bust up, for instance (5)
I believe the answer is:
dodge
'to avoid' is the definition.
(dodging is a kind of avoiding)
'the odd bust up for instance' is the wordplay.
'bust' indicates anagramming the letters.
'up' says the letters should be written backwards (in down clue: letters go upwards).
'for instance' becomes 'eg' ('e.g.' can be a synonym of 'for instance').
'eg' written backwards gives 'ge'.
'odd' with letters rearranged gives 'dod'.
'dod'+'ge'='DODGE'
(Other definitions for dodge that I've seen before include "Evade cunningly" , "Avoid or attempt to" , "Ploy" , "Avoid or evade by bodily movement" , "A quick evasive movement" .)