The judge is the twit with the bunch of roses (8)
I believe the answer is:
assessor
'the judge' is the definition.
(I've seen this before)
'with the bunch of roses' is the wordplay.
'with' means one lot of letters goes inside another.
'the bunch' becomes 'ass' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'of' indicates an anagram (the answer comes from or 'of' the letters).
'roses' anagrammed gives 'essor'.
'ass' going into 'essor' is 'ASSESSOR'.
'is the twit' acts as a link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for assessor that I've seen before include "Examiner" , "Judge of quality" , "Person valuing property" , "inspector" , "Insurance valuer" .)