Joint I hesitate to say in street’s for trendies (8)
I believe the answer is:
hipsters
'trendies' is the definition.
(trendy people)
'joint i hesitate to say in street's' is the wordplay.
'joint' becomes 'hip' (part of body).
'i hesitate to say' becomes 'er' (expression used when hesitating).
'in' indicates putting letters inside.
'street's' becomes 'st's' (abbreviation).
'er' placed inside 'sts' is 'sters'.
'hip'+'sters'='HIPSTERS'
'for' acts as a link.
(Other definitions for hipsters that I've seen before include "She trips (anag.)" , "bottoms" , "trousers" .)