Stranger in Bali endeavours to fit in (5)
I believe the answer is:
alien
'stranger' is the definition.
('alien' can be a synonym of 'stranger')
'bali endeavours to fit in' is the wordplay.
'in' indicates the answer is hidden within the clue.
'ALIEN' can be found hidden inside 'bali endeavours fit'.
'in' is the link.
(Other definitions for alien that I've seen before include "Offensive" , "coming from overseas" , "Belonging to a foreign country" , "24a [ESTRANGE]" , "extraneous" .)