A medium iron (5)
I believe the answer is:
press
This clue is a double definition.
'a medium' is the first definition.
(I know that press is a type of print media)
'iron' is the second definition.
(I know that iron can be written as press)
(Other definitions for press that I've seen before include "Reporters" , "that may gather when news is expected" , "Ram" , "Impel" , "Produce record" .)