Inn artist used en route (2,7)
I believe the answer is:
in transit
'en route' is the definition.
(I've seen this before)
'inn artist used' is the wordplay.
'used' indicates anagramming the letters.
'inn'+'artist'='innartist'
'innartist' anagrammed gives 'IN TRANSIT'.
(Other definitions for in transit that I've seen before include "En route" , "on the wagon?" , "during journey" , "while travelling" , "Being transported" .)