Dance and swim (4)
I believe the answer is:
reel
I believe this is a double definition.
'dance' is the first definition.
(reel is a kind of dance)
'swim' is the second definition.
(I've seen this before)
'and' is the link.
(Other definitions for reel that I've seen before include "Stagger around in the dance" , "Rock" , "spin" , "Move unsteadily (like a Scottish dancer?)" , "Dance; winding drum" .)