Left in tin for tribe (4)
I believe the answer is:
clan
'tribe' is the definition.
(synonyms)
'left in tin' is the wordplay.
'left' becomes 'l' (common abbreviation).
'in' is an insertion indicator.
'tin' becomes 'can' (synonyms).
'l' going inside 'can' is 'CLAN'.
'for' is the link.
(Other definitions for clan that I've seen before include "People related by blood and marriage" , "Group with a tartan?" , "Macdonald, perhaps" , "Scottish tribe" , "Campbells, say?" .)