Ill-mannered (4)
'ill-mannered' is the definition.
(I know that ill-mannered can be written as rude)
This is all the clue.
(Other definitions for rude that I've seen before include "Coarse or discourteous" , "Uncivil" , "Unpleasant" , "Ill-mannered and coarse" , "'Bad-mannered, discourteous (4)'" .)
'ill-mannered' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for boorish that I've seen before include "Ill-mannered and insensitive" , "Coarse - ill-mannered" , "Uncouth" , "Rude - vulgar - rustic" , "Awkward or rude" .)