Swimmer of note (3)
I believe the answer is:
ray
I believe this is a double definition.
'swimmer' is the first definition.
(ray is a type of fish)
'note' is the second definition.
(I've seen this before)
'of' is the link.
(Other definitions for ray that I've seen before include "Lindwall" , "may be electric" , "bit of sunshine" , "Sunbeam or flat fish" , "Beam; flat-bodied fish" .)