The more impolite about Di, the more red in the face (7)
I believe the answer is:
ruddier
'more red in the face' is the definition.
I can't tell whether this defines the answer.
'the more impolite about di' is the wordplay.
'the more impolite' becomes 'ruder' (I've seen this in another clue).
'about' indicates putting letters inside.
'ruder' enclosing 'di' is 'RUDDIER'.
'the' acts as a link.
Can you help me to learn more?
(Other definitions for ruddier that I've seen before include "Redder in complexion" , "Less white" , "More healthy-looking" .)