Empty seats basic unless travelling here (8,5)
I believe the answer is:
business class
'here' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.
'empty seats basic unless travelling' is the wordplay.
'empty' means to remove the middle letters.
'travelling' is an anagram indicator.
'seats' with its middle removed is 'ss'.
'ss'+'basic'+'unless'='ssbasicunless'
'ssbasicunless' is an anagram of 'BUSINESS CLASS'.
Can you help me to learn more?
(Other definitions for business class that I've seen before include "Turn left at top of steps for this" , "MBA seminar" , "where some high-fliers sit" , "(Of a ticket) more expensive, but not first (or quicker!)" .)