Bland cool drink drained instead (7)
I believe the answer is:
insipid
'bland' is the definition.
(I know that bland can be written as insipid)
'cool drink drained instead' is the wordplay.
'cool' becomes 'in' ('in' can mean fashionable or cool).
'drink' becomes 'sip' (sipping is a kind of drinking).
'drained' suggests removing the centre.
'instead' with its centre taken out is 'id'.
'in'+'sip'+'id'='INSIPID'
(Other definitions for insipid that I've seen before include "devoid of flavour" , "Boring and lacking liveliness" , "Dull" , "dry" , "Wishy-washy" .)