Shyster, I assume, conceals agitation (8)

I believe the answer is:

hysteria

'agitation' is the definition.
(both can mean a state of distress)

'shyster i assume conceals' is the wordplay.
'conceals' indicates a hidden word.
'HYSTERIA' can be found hidden inside 'shyster i assume'.

(Other definitions for hysteria that I've seen before include "Frenzied emotional state" , "display of wild emotion" , "Delirium - nervous disorder" , "frenzied excitement" , "Psychoneurotic condition" .)

I've seen this clue in The Telegraph.

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