Wobbly set a danger for star (8)
I believe the answer is:
asterisk
'star' is the definition.
(synonyms)
'wobbly set a danger' is the wordplay.
'wobbly' indicates anagramming the letters (I've seen this in other clues).
'danger' becomes 'risk' (risk is a kind of danger).
'set'+'a'='seta'
'seta' anagrammed gives 'aste'.
'aste'+'risk'='ASTERISK'
'for' is the link.
(Other definitions for asterisk that I've seen before include "Text-marking symbol" , "Sign" , "Character drawing attention to footnote" , "Star for the printer" , "Star on a page" .)