Held up by a railway in the country (7)
I believe the answer is:
hungary
'country' is the definition.
(Hungary is an example)
'held up by a railway in the' is the wordplay.
'held up by' says to put letters next to each other (in a down clue, some letters hold others up).
'railway' becomes 'ry' (abbreviation for railway).
'in the' becomes 'hung' (I can't justify this - if you can you should give a lot more credence to this answer).
'a'+'ry'='ary'
'ary' put after 'hung' is 'HUNGARY'.
Can you help me to learn more?
(Other definitions for hungary that I've seen before include "part of Europe" , "country in Europe" , "Country bordered by Slovakia, Ukraine, Romania, Serbia, Croatia, Slovenia and Austria" , "Country where Magyar is spoken" , "Liszt's land" .)