To arrange characters in line sort scenery (7)
I believe the answer is:
typeset
'to arrange characters in line' is the definition.
(setting out letters)
'sort scenery' is the wordplay.
'sort' becomes 'type' (type is a kind of sort).
'scenery' becomes 'set' (a stage set).
'type'+'set'='TYPESET'
(Other definitions for typeset that I've seen before include "Arrange (text) for printing" , "(Of fonts) ready to print" , "Like" , "Ready to go public" , "characters lined up ready for a run-off?" .)