Writer raised hesitation over old railway worker (8)
I believe the answer is:
reporter
'writer' is the definition.
(I've seen this before)
'raised hesitation over old railway worker' is the wordplay.
'raised' shows that the letters should be reversed in order (going up in a down clue).
'hesitation' becomes 'er' (sound made while hesitating - um, er).
'over old railway worker' becomes 'porter' (I am not sure about this - if you are sure you should believe this answer much more).
'er' reversed gives 're'.
're'+'porter'='REPORTER'
Can you help me to learn more?
(Other definitions for reporter that I've seen before include "One writing in newspaper" , "Newshound" , "News journalist" , "Newspaper worker" , "Newspaper correspondent, journalist" .)