Blunder along with job (6)
I believe the answer is:
errand
'job' is the definition.
(thesaurus)
'blunder along with' is the wordplay.
'blunder' becomes 'err' (I've seen this before).
'along with' becomes 'and'.
'err'+'and'='ERRAND'
(Other definitions for errand that I've seen before include "Mission (often run)" , "Chore" , "short shopping trip" , "Task, message" , "Short commission" .)