See great changes in cheapest class (8)
I believe the answer is:
steerage
'cheapest class' is the definition.
(cheapest accommodation on a boat)
'see great changes' is the wordplay.
'changes' indicates anagramming the letters.
'see'+'great'='seegreat'
'seegreat' is an anagram of 'STEERAGE'.
'in' is the link.
(Other definitions for steerage that I've seen before include "Cheap accommodation on a passenger ship" , "Ship's accommodation with lowest fares" , "cheap way to travel" , "Old word for cheapest passenger accommodation in ship" , "Cheapest classes" .)