What one of those in Labour has to show for a lifetime in Rush? (6)
I believe the answer is:
career
I believe this is a double definition.
'what one of those in labour has to show for a lifetime' is the first definition.
'rush?' is the second definition.
(thesaurus)
'in' is the link.
(Other definitions for career that I've seen before include "Life's occupation" , "Not intellectual" , "Run - profession" , "Make rapid progress" , "Job (supposedly for life?)" .)