Reads one's fortune in tealeaves, for instance, or wine dregs (8)
I believe the answer is:
portends
'reads one's fortune in tealeaves for instance' is the definition.
I can't judge whether this definition defines the answer.
'wine dregs' is the wordplay.
'wine' becomes 'port' (port is a kind of wine).
'dregs' becomes 'ends' (I can't explain this - if you can you should believe this answer much more).
'port'+'ends'='PORTENDS'
'or' is the link.
Can you help me to learn more?
(Other definitions for portends that I've seen before include "Signals" , "Gives warning" , "Indicates by signs" , "Augurs, bodes" , "Warns" .)