Very important article about married railway worker (9)
I believe the answer is:
signalman
'railway worker' is the definition.
(I know that signalman is a type of railway worker)
'very important article about married' is the wordplay.
'very important' becomes 'signal' (I've seen this before).
'article' becomes 'an' (English indefinite article).
'about' means one lot of letters go next to another.
'married' becomes 'm' (abbreviation, e.g. in genealogy).
'an' put after 'm' is 'man'.
'signal'+'man'='SIGNALMAN'
(Other definitions for signalman that I've seen before include "Railway employee controlling points" , "Rail worker" , "Main slang (anag.)" , "one controlling traffic movement" , "Railway worker" .)