He's in a spin (4)
I believe the answer is:
eddy
This clue is a double definition.
'he's' is the first definition.
'a spin' is the second definition.
(I've seen this before)
'in' acts as a link.
(Other definitions for eddy that I've seen before include "Chap" , "A small whirl of water" , "Twist" , "moving water" , "Swirl; Duane -, US guitarist" .)