Different term for the University of London (4)
I believe the answer is:
else
'different' is the definition.
(synonyms)
'term for the university of london' is the wordplay.
'term for' indicates one should take the final letters (the letter which terminates the word).
'university of london' becomes 'LSE' (London School of Economics).
The final letter of 'the' is 'e'.
'e'+'lse'='ELSE'
(Other definitions for else that I've seen before include "Adverb meaning if not, otherwise" , "Besides; instead" , "In addition; different" , "In addition, besides" , "Alternatively" .)