In abrupt style, points out a dodgy dud (6)
I believe the answer is:
sudden
'in abrupt' is the definition.
'sudden' can be an answer for 'abrupt' (similar in meaning). I'm unsure of the 'in' bit.
'style points out a dodgy dud' is the wordplay.
'style' becomes 's' (this might be a standard abbreviation of which I'm unaware).
'points' becomes 'en' (two compass points).
'out' means one lot of letters goes inside another.
'a dodgy' indicates anagramming the letters (a dodgy or wrong order of the letters).
's'+'en'='sen'
'dud' anagrammed gives 'udd'.
'sen' enclosing 'udd' is 'SUDDEN'.
Can you help me to learn more?
(Other definitions for sudden that I've seen before include "Quick and unexpected" , "Done unexpectedly" , "Immediate and surprising" , "Happening abruptly" , "Abrupt, unexpected" .)