To be vulgar is beneath one (5)
I believe the answer is:
below
'to be vulgar is beneath one' is the definition.
I can't judge whether this defines the answer.
'to be vulgar is beneath' is the wordplay.
'vulgar' becomes 'low'.
'is beneath' means one lot of letters go next to another (in a down clue, some letters go beneath others).
'be'+'low'='BELOW'
Can you help me to learn more?
(Other definitions for below that I've seen before include "second-rate" , "as mentioned later" , "Subordinate to" , "Beneath" , "Not worthy of" .)