Immersed in fluid swirling in an eddy (4)
I believe the answer is:
dyed
'immersed in fluid swirling in' is the definition.
Although both the answer and definition are past participle verbs, I cannot see how they can define each other.
'eddy' is the wordplay.
'eddy' can be anagrammed to 'DYED'.
Though, I'm unsure how this is indicated.
'an' acts as a link.
Can you help me to learn more?
(Other definitions for dyed that I've seen before include "Cloth is often" , "Changed the colour of fabric" , "Tinted" , "(Of fabric) coloured" , "Coloured by dipping in liquid" .)