Not those, in short, travelling round the East (6)
I believe the answer is:
others
'not those' is the definition.
(I've seen this before)
'short travelling round the east' is the wordplay.
'travelling' indicates anagramming the letters.
'round' is an insertion indicator.
'the east' becomes 'e' (synonyms).
'short' with letters rearranged gives 'othrs'.
'othrs' enclosing 'e' is 'OTHERS'.
'in' is the link.
(Other definitions for others that I've seen before include "Different from those already mentioned" , "Not the same one already mentioned" , "Different ones" , "He rots (anag.)" , "The rest" .)