Red-faced swear word (5)
I believe the answer is:
ruddy
'red-faced' is the definition.
(thesaurus)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for ruddy that I've seen before include "Rubicund" , "blasted" , "Red in the face (like a duck?)" , "Bright" , "healthy-looking" .)