Half of Mediterranean island is like this (3)
I believe the answer is:
sic
'like this' is the definition.
The definition suggests a singular noun but the answer is not.
'half of mediterranean island' is the wordplay.
'half of' indicates taking half.
'mediterranean island' becomes 'sicily' (I've seen this before).
'sicily' cut in half is 'SIC'.
'is' is the link.
Can you help me to learn more?
(Other definitions for sic that I've seen before include "poorly spelt if requiring this" , "'Thus, in printing (3)'" , "the reading is correct" , "Thus, sounds ill" , "(Of quoted word) exactly so" .)