See great changes in economy travel (8)
I believe the answer is:
steerage
'economy travel' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe there's a link between them I don't understand?
'see great changes' is the wordplay.
'changes' is an anagram indicator.
'see'+'great'='seegreat'
'seegreat' with letters rearranged gives 'STEERAGE'.
'in' is the link.
Can you help me to learn more?
(Other definitions for steerage that I've seen before include "Formerly cheapest space on board" , "cheap transport" , "Cheapest accommodation aboard ship" , "Cheapest accommodations on old passenger ships" , "Cheap seats" .)