Crossword Genius

Immersed in fluid swirling in an eddy (4)

Ross

I believe the answer is:

dyed

I'm a little stuck... Click here to teach me more about this clue!

'immersed in fluid swirling in' is the definition.
Although both the answer and definition are past participle verbs, I can't understand how one could define the other.

'eddy' is the wordplay.
'eddy' can be anagrammed to 'DYED'.
But, I'm not clear how the anagram 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" .)

I've seen this clue in the Evening Standard.
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