Simpler career? Nonsense (10)
I believe the answer is:
balderdash
'nonsense' is the definition.
(balderdash is a kind of nonsense)
'simpler career?' is the wordplay.
'simpler' becomes 'balder'.
'career?' becomes 'dash' (both can mean to move chaotically).
'balder'+'dash'='BALDERDASH'
(Other definitions for balderdash that I've seen before include "Poppycock" , "Bunk" , "Twaddle" , "stupid talk" , "Codswallop" .)