Indication from sassy MP to Minister (7)
I believe the answer is:
symptom
'indication' is the definition.
(symptom is a kind of indication)
'from sassy mp to minister' is the wordplay.
'from' indicates a hidden word.
'SYMPTOM' can be found hidden inside 'sassy mp to minister'.
(Other definitions for symptom that I've seen before include "Prodrome" , "sign all's not well" , "It indicates disease" , "Indicator of disease" , "It alerts one to illness" .)