Discredited, got rid of guards in the morning (6)
I believe the answer is:
shamed
'discredited' is the definition.
(synonyms)
'got rid of guards in the morning' is the wordplay.
'got rid of' becomes 'shed' (shed can mean to lose or cast off).
'guards' is an insertion indicator (inserted letters are guarded).
'in the morning' becomes 'am' (short for ante meridiem - before noon).
'shed' going around 'am' is 'SHAMED'.
(Other definitions for shamed that I've seen before include "Dishonoured, disgraced" , "in disgrace?" , "Abashed" , "Made to feel guilty and inferior" , "Disgraced or humiliated" .)