It's further coming back from Yugoslavia (4)
I believe the answer is:
also
'it's further' is the definition.
(thesaurus)
'coming back from yugoslavia' is the wordplay.
'coming back' says the letters should be written backwards.
'from' says the answer is hidden in the clue.
'osla' is hidden within 'yugoslavia'.
'osla' written backwards gives 'ALSO'.
(Other definitions for also that I've seen before include "To boot" , "item's rarely used now for this" , "As well, in addition" , "admitted to Royal Society > too" , "an indication of more to come" .)