Bookish student on route, forsaking home (8)
I believe the answer is:
literary
'bookish' is the definition.
(I've seen this before)
'student on route forsaking home' is the wordplay.
'student' becomes 'l' (as in L-plates for learner drivers).
'on' is a charade indicator (letters next to each other).
'route' becomes 'itinerary' (I've seen this before).
'forsaking' suggests deleting specific letters.
'home' becomes 'in' ('he's home' can mean 'he's in').
'itinerary' with 'in' taken away is 'iterary'.
'l'+'iterary'='LITERARY'
(Other definitions for literary that I've seen before include "Indicates writing of artistic value" , "Relating to good creative writing" , "collection of editions of books" , "The scholarly type" , "Well-read" .)