Biblical figure suppressed by vilest Herod (6)
I believe the answer is:
esther
'biblical figure' is the definition.
(Old Testament queen)
'suppressed by vilest herod' is the wordplay.
'suppressed by' says the answer is hidden in the clue.
'ESTHER' is hidden within 'vilest herod'.
(Other definitions for esther that I've seen before include "Good book" , "Oratorio by Handel; girl's name" , "Biblical heroine, who married the king of Persia" , "Section of Bible" , "Girl's name; OT book" .)