Boor not here to support Liberal (4)
I believe the answer is:
lout
'boor' is the definition.
(I've seen this before)
'not here to support liberal' is the wordplay.
'not here' becomes 'out' (I've seen this in another clue).
'to support' says to put letters next to each other (in a down clue, some letters hold up others).
'liberal' becomes 'l' (abbreviation).
'out' after 'l' is 'LOUT'.
(Other definitions for lout that I've seen before include "Ignorant, awkward fellow" , "'Rude, ill-mannered fellow (4)'" , "A noisy badly-behaved fellow" , "Uncouth chap" , "A noisy, badly behaved youth" .)