A blow to discomfit anybody (5)
I believe the answer is:
abash
'discomfit anybody' is the definition.
'abash' can be an answer for 'discomfit' (abashing is a kind of discomfiting). I am not sure about the 'anybody' bit.
'a blow' is the wordplay.
'blow' becomes 'bash' (bash is a kind of blow).
'a'+'bash'='ABASH'
'to' acts as a link.
Can you help me to learn more?
(Other definitions for abash that I've seen before include "Affront" , "Discomfit" , "Disconcert" , "put one to shame" , "Bring shame on" .)