Seat breaks with danger for star (8)
I believe the answer is:
asterisk
'star' is the definition.
('asterisk' can be a synonym of 'star')
'seat breaks with danger' is the wordplay.
'breaks' indicates anagramming the letters.
'with' means one lot of letters go next to another.
'danger' becomes 'risk' ('risk' can be a synonym of 'danger').
'seat' anagrammed gives 'aste'.
'aste'+'risk'='ASTERISK'
'for' is the link.
(Other definitions for asterisk that I've seen before include "Star in print" , "Printer's star" , "Star-shape on the page" , "Star of typography" , "Text-marking symbol" .)