Drink is shown to be the real trouble in court (6)
I believe the answer is:
claret
'drink' is the definition.
(claret is a kind of drink)
'real trouble in court' is the wordplay.
'trouble' is an anagram indicator.
'in' means one lot of letters goes inside another.
'court' becomes 'ct' (abbreviation used in road names).
'real' with letters rearranged gives 'lare'.
'lare' put inside 'ct' is 'CLARET'.
'is shown to be the' 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 claret that I've seen before include "French wine" , "Purplish-red - blood" , "Red wine from southern France" , "Deep purplish colour" , "Dry red wine of Bordeaux" .)