High Street done badly (6)
I believe the answer is:
stoned
'high' is the definition.
(on drugs)
'street done badly' is the wordplay.
'street' becomes 'st' (abbreviation).
'badly' indicates an anagram (letters in the wrong order).
'done' is an anagram of 'oned'.
'st'+'oned'='STONED'
(Other definitions for stoned that I've seen before include "High; intoxicated" , "High on a drug" , "Slangily drunk or pelted with rocks" , "Are cherries so" , "attacked with missiles" .)