Fashionable little drink I had is tasteless (7)
I believe the answer is:
insipid
'tasteless' is the definition.
(similar in meaning)
'fashionable little drink i had' is the wordplay.
'fashionable' becomes 'in' (in can mean fashionable or trendy).
'little drink' becomes 'sip' (a sip of something is a small drink of it).
'i had' becomes 'i'd' (I'd).
'in'+'sip'+'id'='INSIPID'
'is' acts as a link.
(Other definitions for insipid that I've seen before include "devoid of flavour" , "Boring and lacking liveliness" , "Tasteless" , "dry" , "Lacking taste or flavour" .)