Move round old poster originally hanging in inn (9)
I believe the answer is:
roadhouse
'inn' is the definition.
(roadhouse is a kind of inn)
'move round old poster originally hanging' is the wordplay.
'move' becomes 'rouse' (rousing is a kind of moving**).
'round' indicates putting letters inside.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'poster' becomes 'ad'.
'originally' indicates taking the first letters.
The first letter of 'hanging' is 'h'.
'o'+'ad'+'h'='oadh'
'rouse' going around 'oadh' is 'ROADHOUSE'.
'in' acts as a link.
(Other definitions for roadhouse that I've seen before include "place of refreshment" , "Country inn" , "pub, by the way" , "accommodation" .)