Discomfit (5)
I believe the answer is:
abash
'discomfit' is the definition.
(I know that abash is a type of discomfit)
This is all the clue.
(Other definitions for abash that I've seen before include "Strike with embarrassment" , "Cause to feel ashamed" , "Discomfit" , "Rattle" , "Cause embarrassment" .)