On tour, assistant of Iron Lady died inwardly (6)
I believe the answer is:
roadie
'on tour assistant' is the definition.
'iron lady died inwardly' is the wordplay.
'iron lady' becomes 'road' (I am not sure about this - if you are sure you should believe this answer much more).
'inwardly' says to take the centre (only the letters inside the word are used).
The middle of 'died' is 'ie'.
'road'+'ie'='ROADIE'
'of' acts as a link.
(Other definitions for roadie that I've seen before include "Touring musicians' gofer" , "Star's assistant" , "One on tour" , "Band crew member" , "Person moving and setting up band's equipment" .)