Blew in during tea, unexpectedly, for a drink (5,4)
I believe the answer is:
table wine
'a drink' is the definition.
(table wine is a kind of drink)
'blew in during tea unexpectedly' is the wordplay.
'during' indicates putting letters inside.
'unexpectedly' indicates an anagram.
'blew'+'in'='blewin'
'tea' with letters rearranged gives 'tae'.
'blewin' inserted inside 'tae' is 'TABLE WINE'.
'for' acts as a link.
(Other definitions for table wine that I've seen before include "Plonk" , "Drink with meal" , "Drink with meals" .)