Crossword Genius

Fat: felt anxious, terribly uncertain as to what should be done (2,1,5,2,4)

Ross

I believe the answer is:

in a state of flux

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'uncertain as to what should be done' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'fat felt anxious terribly' is the wordplay.
'terribly' indicates anagramming the letters.
'fat'+'felt'+'anxious'='fatfeltanxious'
'fatfeltanxious' anagrammed gives 'IN A STATE OF FLUX'.

Can you help me to learn more?

(Other definitions for in a state of flux that I've seen before include "Continuously changing" , "continually changing?" .)

I've seen this clue in The Telegraph.
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