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' indicates anagramming the letters.
'in' is an insertion indicator.
'court' becomes 'ct' (abbreviation used in road names).
'real' is an anagram of 'lare'.
'lare' going within 'ct' is 'CLARET'.
'is shown to be the' acts as a link.
This may not be right. 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" .)