Notice seabird following frisbee (7)
I believe the answer is:
discern
'notice' is the definition.
(I've seen this before)
'seabird following frisbee' is the wordplay.
'seabird' becomes 'ern' (I've seen this in another clue).
'following' is a charade indicator (letters next to each other).
'frisbee' becomes 'disc' (I've seen this in another clue).
'ern' put after 'disc' is 'DISCERN'.
(Other definitions for discern that I've seen before include "spot" , "Notice" , "See" , "Pick out" , "Cinders (anag)" .)