Boring person with new style, in retrospect (4)
I believe the answer is:
yawn
'boring person' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.
'with new style in retrospect' is the wordplay.
'with' is a charade indicator (letters next to each other).
'new' becomes 'n'.
'style' becomes 'way' ('way' can be a synonym of 'style'**).
'in retrospect' shows that the letters should be reversed in order.
'n' next to 'way' is 'nway'.
'nway' written backwards gives 'YAWN'.
Can you help me to learn more?
(Other definitions for yawn that I've seen before include "Expression of tiredness" , "Show boredom" , "Tedious thing" , "Bore" , "Bored sign" .)