Gave notice to assistant about to get forced out (8)
I believe the answer is:
apprised
'gave notice to' is the definition.
'assistant about to get forced out' is the wordplay.
'assistant' becomes 'pa' (personal assistant).
'about' says the letters should be written in reverse.
'to get' is a charade indicator (letters next to each other).
'forced out' becomes 'prised'.
'pa' backwards is 'ap'.
'ap'+'prised'='APPRISED'
(Other definitions for apprised that I've seen before include "told?" , "Advised, made aware of" , "Informed" , "Notified" .)