Popular drink yours truly would find tasteless (7)
I believe the answer is:
insipid
'tasteless' is the definition.
(similar in meaning)
'popular drink yours truly would' is the wordplay.
'popular' becomes 'in' ('in' can mean trendy).
'drink' becomes 'sip' (sipping is a kind of drinking).
'yours truly' becomes 'I' (the person who set this crossword).
'would' becomes 'd' (as in 'we'd' - 'we would').
'in'+'sip'+'i'+'d'='INSIPID'
'find' acts as a link.
(Other definitions for insipid that I've seen before include "Boring and lacking liveliness" , "Lacking 10" , "Wishy-washy" , "Jejune" , "Bland, flavourless" .)