Tea with fashionable set (5)
I believe the answer is:
chain
'set' is the definition.
(I have seen 'A set' mean 'chain' so perhaps 'set' could also mean 'chain')
'tea with fashionable' is the wordplay.
'tea' becomes 'cha' (cha is a type of tea).
'with' says to put letters next to each other.
'fashionable' becomes 'in' (in can mean fashionable or trendy).
'cha'+'in'='CHAIN'
(Other definitions for chain that I've seen before include "It's as strong as its weakest link" , "distance for a run?" , "Connected sequence" , "Rope of metal links" , "Series of things linked together" .)